How To Diagnose Code P1259 Honda Accord

Hi guys and welcome to another episode.
This is one way to check your Valve and another thing that you need to do is remove the 3 bolts on top of the valve and with your finger, check for free movement of the solenoid plunger.
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Disclaimer.
This video contains tips and recommendations only.
Bullet Solano Shall not be liable for any harm, injury damage or if anything bad happens to your vehicle or property got in the process of repair and replacement due to use or misinterpretation of the information on this video.
Keep in mind that if you buy low quality auto parts does not guarantee the adequate level of road safety.

[@Unclejake]

Dude you saved me! My oil pressure switch was bad, I changed the oil and installed a complete new VTEC solenoid....same problem...the service manual didn’t show me any readings, across the switch, used your method yep brand new assembly, bad oil pressure switch. Thanks!

[@BulletSolano]

Nice

[@bryancarballo1087]

Are you sure that we have to check continuity with the Switch off ?

[@rronmar]

@@bryancarballo1087 with the pressure sensor wire disconnected there is no power to the switch anyway so it would make no difference. Ohm meters measure continuity/resistance by sending power thru the device being tested. If the device is still wired into the circuit, any power on the circuit will confuse the test meter, so generally you want all power off for any resistance/continuity testing...

[@michaelbradley1636]

Hi guys, I kept getting a CEL with P1259 on 2000 Honda Accord 2.3L Vtec engine. If you've reviewed about a half dozen youtube vids, by now you know to first check oil to see if very low or dirty, which will plug the screen to the Vtec solenoid or cause no/low oil pressure through the Vtec oil pressure sensor on the same integrated part. The OP sensor on the side and Vtec solenoid on top WORK TOGETHER to make Vtec work. I replaced BOTH and did a complete oil change (with correct grade oil as shown on the oil add cap on the valve cover), since I had just bought the car and wasn't sure what grade oil was in there. I have to smog it for CA, since I just bought it. But, the CEL P1259 still came back on (after I cleared it with my OBD2 scanner) about 15 miles later. Then I realized the problem was probably wiring. One vid shows how to test the solenoid, by connecting to 12V positive with a jumper cable, if you hear a "click", it's working (at least the plunger is opening, but that doesn't mean the screen on the gasket isn't clogged). But I had just replaced it with a new one, so it was wiring. Then I found this vid on testing OP sensor and Vtec sensor TOGETHER by CONNECTING THEM IN SERIES. The short story is, cut the negative wire on the OP sensor (the blue wire) and connect it to the single positive wire to the Vtec sensor. The Vtec sensor has only one wire because it's grounded to the integrated part, therefore, the engine. Why Honda had both a positive and neg lead on the OP sensor, I don't know, but I'm sure glad they did. When I did that, it "forced" the two sensors to work together, and no more bogging down at 4000 rpm, now it doesn't hesitate to go to 5000 rpm at all. It's fixed. Here's the vid: kzbin.info/www/bejne/a2i7f2abh7aoas0

[@cheefussmith9380]

Wow, thanks man! You know your stuff

[@BulletSolano]

Thanks

[@daowause]

When you took the reading on the oil pressure switch, you had continuity. If the switch was open or no continuity, the meter would show 0L like it did when you turned it on. It should read 0.0 or really close to it when the car is off.

[@elijahpeele3915]

Good job never quit

[@BulletSolano]

Thanks man

[@johnnycasanova7134]

Hey my friend on taking off the V-Tec solenoid. You can make your own tool by getting a 10mm socket and welding it to an open end wrench at the top of the 1/4 in. drive socket.It works perfectly. I took the 2 bolts on side off using it. OK I am having trouble with my 2000 accord. I replaced my solenoid and it still shows a P1259. I'm gonna try checking the wires with your video. Car run great but it's the check engine light I want off.

[@BulletSolano]

Ok bro thanks

[@sharkfitnessfitness8737]

Thnx 👍🏿

[@VinnieVega76]

Can you check it off of the vtec solenoid? 22mm wrench easier to get to it

[@Charlie-Bee]

What does the other plug go to? The green plug on my car was attached to something else and the oil pressure switch had a grey plug. They look identical except for color. So what is the grey one?

[@captainsilver2048]

On my civic with a b18c the voltage to the pressure switch is about 9 volts . Is that too low?

[@RandyMontanez1]

Thank you for posting the video. I'm having the same issue my check engine light comes on and I have a vtec solenoid code, I've already done an oil change and replaced the entire vtech housing. But the code keeps coming back on, I've checked oil level as well to be sure it was topped off. Any suggestions moving forward?

[@BulletSolano]

Check the connector to the vtec solenoid

[@Hgfhcdfvxghvdgg]

@bullet I have a 2001 accord. No codes and it runs very sluggish almost like there’s a blockage. Do you think the catalytic converter could be plugged. I’m sorry the code p0420 pops up. Just remembered that.

[@BulletSolano]

Hey bro, yes you need to replace your cat

[@johnnycasanova7134]

I have a question. I just replaced the V-Tech Switch on my 2000 Accord with one I bought on E-Bay and I'm still getting a P1259. When I plug the pressure switch plug it does not make a click to show that it's properly plugged in. I think the connection in the pressure switch is messed up. So I just purchased a pressure switch on E-Bay and waiting on it to come in. Can I check the pressure switch oms with it not being installed on the car? I have 2 Accords one is a 2000 and the other is a 2001. I noticed that my other cars pressure switch is leaking oil but is not show a check engine light so I am just gonna put the new switch on the one that I am replacing which is brand new and try to fix it so that one so I can install it on the one that is leaking oil. So what you think? thanx

[@BulletSolano]

Yes you can check for ohms in the valve outside the car, but if you still have the code just get a new Solenoid.

[@giansaavedra4800]

Hey i need help i had a p1259 code on my 2002 honda accord and it was sluggish in 1st gear and delayed shift to 2nd gear and would not rev high. So i changed the solenoid but the check engine light is still on and the shifting got better but it’s half and half sometimes delayed and sometimes it’ll be smooth any idea ?

[@BulletSolano]

1 of the reasons is low oír or maybe the oil viscosity is not the right one, another thing is connection to the PCM But in most cases is low oil level

[@daydaya5710]

09l999olollp000

[@cameronx8467]

1st the vtec solenoid was changed then I find out there was only two quarts of oil in the car but no oil light came on and when I rev the engine over 5000 rpm it sometimes big down and now I found a small oil leak I don't know what to do and I'm trying to get it to pass inspection

[@BulletSolano]

Check the connector

[@jonathansanchez5434]

Hi great video. Just need clarification, are you testing the oil pressure sensor or the oil pressure switch? I tested the one on the top and that’s the oil pressure sensor not switch right?

[@BulletSolano]

Jonathan Sanchez that’s correct

[@jonathansanchez5434]

Thank you.

[@BulletSolano]

No problem

[@angelf9800]

Is code P1259 the part you are showing us the Solenoid or the whole Vvt Assembly has to be replace.

[@jrodriguez5483]

Hi I have a 98 honda accord ex I got a new vtec solenoid on it and did an egr cleaning any other tips

[@BulletSolano]

You should be good

[@navybrat7173]

@Bullet ..........I have the same code. Changed the plugs, wires, and V-Tech switch and it's just as bad. When the plugs were taken out the 2 plugs on the passenger side were black with either oil or gas on them and the other 2 were fine. Now with the new parts checked the plugs and all 4 are black. All within 2 days. But I can tell you that when this started to happen is after I filled the tank with gas and within 20 minutes of driving I got all the codes and the car started sputtering and now it's cutting off when you stop. Could it be the oil pressure switch?

[@navybrat7173]

Oh it's a 2001 Honda Accord 2.3l V-Tech

[@BulletSolano]

Hey man sorry to hear that, before you start changing parts put some fuel system cleaner and run the car until the bad gas go away then put some good gas and 1 more fuel system cleaner

[@navybrat7173]

Hopefully I can tell you later today if that works. If not I won't know what else to do but change the oil sensor. Thanks for talking with me and I will get back to you.

[@BulletSolano]

No problem i hope you’ll get it going

[@johnatancarassa1317]

Hi bullet I have a problem with that code p1259 on my accord it is not power on the first shift and something sound on the button is maybe can be the catalytic

[@BulletSolano]

Do you have a check engine light with P1259?

[@johnatancarassa1317]

yes I went to auto zone and that is what it shows, I changed the timing belt and the water pomp 4 weeks ago

[@BulletSolano]

Ok then remove the solenoid and cleaned and check if still good, other wise replaced it

[@mattcarter7400]

I had code P1252 can’t figure out what it is

[@user-crunchypear]

Hey bullet, my car doesn’t want to engage in lower gears. I have to accelerate a bit in order to get moving. Also it takes time to shift. What could be the issue I also get the code you talk about in the video

[@user-crunchypear]

I just changed the engine oil yesterday as well with synthetic and it’s at good oil level

[@BulletSolano]

Hey, transmission is getting bad

[@danielandujar5479]

Hi Broo:) My friend just bought a honda accord 2000 with that same engine you're fixing. And it has 2 codes the IAT and the EGR But was running and there's was an intermitent miss. Then his wife drove the car and the car stalls and now it wont start . There's spark and fuel and it tries to start but dont. Even if you put some carb cleaner it wont start. And i was checking and i see that connector to the vtec solenoid Off and the other one down for the preasure disconnected And there's s code 1259. Can that be his problem for the engine not start??? Please need some help SOON🙏Thank's

[@BulletSolano]

Clean the egr valve, egr passage and check the timing belt

[@danielandujar5479]

@@BulletSolano Thank's for your fast response👍 Will do it tomorow🏃‍♂️ May ghe Lord Bless🙏

[@dbigtigger8801]

Have a 2000 accord 2.3l vtec.. I'm getting p1259 code..replaced vtec solenoid, clean oil, removed and cleaned plenum as well as IACv..car will not rev past 4000rmps..help!!!!

[@BulletSolano]

The oil is the correct size? 5W30?

[@BulletSolano]

If the oil is correct and you don’t have any additives the connector to the vtec solenoid valve is bad

[@dbigtigger8801]

@@BulletSolano how do I test the connection

[@BulletSolano]

With a multimeter check the connector for voltage just like in the video

[@dbigtigger8801]

@@BulletSolano I checked the plug with key in the on position. Same voltage as the battery. Vtec i solenoid is new.. I put a another engine in this car because the last one dropped a valve from previous owner.. I was able to drive it for a little while..it also showed 1259 code ..I'm lost.. any help would be appreciated

[@memogarcia7784]

Hi bullet I have the same p1259 code and I changed the vtec solenoid and got a brand new one but it still has the check engine light on what can it be?

[@BulletSolano]

Did you reset the light after you change the valve?

[@memogarcia7784]

Bullet Solano yes I used the obd scanner to erase it and when I turned it on the light turned back on

[@BulletSolano]

Check the conector

[@memogarcia7784]

Bullet Solano do I need a multimeter to check the connector?

[@BulletSolano]

Yes

[@jonathanstyles8212]

This video was a lot of help. My switch certainly measured 0 Ohms. I replaced it - now the P1259 code comes up as soon as I start idling the car. Anything I can check with the single-wire connector to the solenoid? I was only getting the P1259 code after getting past 3k RPMs previously, now it is coming on as soon as I start the car. Any ideas would be greatly appreciated. Even if I have to replace the entire assembly, that is fine - but I want to know WHY I had to replace it. :) Thanks!

[@BulletSolano]

Check oil level, after that removed the valve clean it and do a test on it kzbin.info/www/bejne/kGi5iYyHbrF7l9E

[@jonathanstyles8212]

@@BulletSolano Thanks for the quick reply! To clarify, I already performed a flush and then an oil change (with filter) using 5w-30. I just changed the head gasket, water pump and timing belt a few weeks prior and did an oil change then too. Today, whilst changing the switch, I pulled the VTEC assembly off, but there was nothing built-up in the chambers or clogging the screen. I re-assembled it (lubing all moving parts with Marvel Mystery Oil), made sure the plunger moved up and down freely, and re-assembled everything. I realized that I did not transfer the gasket over from the old oil pressure switch to the new one. So, I was really hoping that this was all that it was and that it was just losing pressure without the gasket and sending the code. However, after fixing it all the code still jumps on immediately. Like I said, the light now turns on at idle where it did not previously. I'm leaning more towards electrical/short. I'm just not sure how to test the solenoid itself on the single wire. The only other thing I can think is ECM, but I would hope that I would see more than one system affected. Any other ideas you might be able to throw at me are greatly appreciated. I'm a seasoned mechanic - I just do not know much about these specialized systems... or Honda in general. lol Working on this for a colleague. Again, thank you!

[@BulletSolano]

Ok no problem, in the link I send you I show how to test the solenoid, check that out, because I think that’s where the problems is the vtec solenoid is bad!!

[@jonathanstyles8212]

@@BulletSolano Alright... I applied 12v at the solenoid wire and it is getting a mighty click noise - so, I assume it is working. I tested everything again, and it seems I'm only getting 9.8v from the oil pressure switch voltage wire. Any idea what feeds this? I cannot find wiring diagrams for this anywhere.

[@BulletSolano]

Check online on how to bypass the oil pressure switch is the D6 connector and see if that works

[@leoshepherd1982]

Today my oil light came on flashing like wtf..came down to 40kms until I was safe to pull over 100kms zone,no rasshole oil was the cause of why it wasn't revving over 400 rpm...but where did the oil go within 5000kms..

[@BulletSolano]

Replace the PCV valve that’s going to help, it depends on mileage and the way you drive, most likely piston ring or valve seats or seals, I think new engine is on your near future

[@valcon7gaming]

I swapped my engine from a F23A1 to a F23A. I noticed that I see no connection or plug for the green connection. Kind of confused here lol

[@rossewing1605]

Non vtec motor?

[@marioman218]

Hi Bullet, thank you for making this detailed and informative video. I had a question I was hoping you’d have an answer to. I have a 2000 accord 2.3L with the P1259 code, I have continuity as well as 12V at the connector and the solenoid itself appears to be new (I just bought the car so I’m not sure but it’s very shiny!) it has 105,000 miles on it and I just changed the oil too, I disconnected the battery but the code returned. Any guesses? Thank you in advance!

[@BulletSolano]

Probably is a cheap solenoid, and need to be replaced

[@marioman218]

@@BulletSolano thank you!

[@marioman218]

Hi Bullet, wanted to reply here. I bought an official Honda solenoid (remanufactured) and wrestled with that lower bolt for a while lol (eventually I just dremeled a 10mm socket in half that fit in between the thermostat housing and the solenoid. Anyway I replaced it, reset battery, and no more code or hesitation at 4,000 RPM. Next going to tackle a suspension rebuild and engine mount replacement. Thanks for all of your videos!

[@BulletSolano]

Nice

[@marioman218]

@Jose Fuentes Sorry for the late reply, I did not try to energize it with 12v myself, I only tested to make sure it was receiving 12v and that it had continuity.

[@KabiruAlabi-rl4tw]

Hi I have a problem with my Honda Accord 2000 model when I started in the morning it’s a shitty and I don’t know how to figure that shit out

[@BulletSolano]

Scan the vehicle for codes

[@jaylunaguitar]

Hey Bullet! So I got P1259 today and I'm trying to figure out what's wrong. I changed the oil myself about a month ago with Mobil One Synthetic so it's fresh. I checked the oil level in a parking lot and it's fine. I think it's leaking on the outside of the solenoid and I know that's a common problem. Could the common Vtec solenoid leak cause P1259? Thanks!

[@BulletSolano]

Hey bro, most likely the solenoid is dirty or bad

[@jaylunaguitar]

@@BulletSolano Ok cool thanks! I'll watch your videos and get to it.

[@jaylunaguitar]

@@BulletSolano So where did you put the black multimeter cable on the switch for checking voltage? What exactly is considered ground?

[@BulletSolano]

Negative on the battery

[@angelf9800]

Is this the same procedure on 1999 Honda Accord

[@BulletSolano]

Yes

[@rsxonprogress9488]

This code just came on my acura rsx it has a new vtec solenoid i just changed the oil maybe 1000 miles ago and i put liqui molly oil addictive and lucas oil now my car is marking the vtec code i dont know what to do And it also has mobil oil

[@BulletSolano]

Liqui molly and Lucas at the same time probably is to thick for the engine, if you just do oil change regularly you shouldn’t have any problems, the oil is too thick and probably doesn’t flow right on the vtec solenoid

[@rsxonprogress9488]

@@BulletSolano thanks for the tip bro ! And yeah man i just changed the oil and reset the code its fine now just the knock sensor switch code goes on and off

[@rsxonprogress9488]

@@BulletSolano can you go to my page and see my video of my acura rsx ticking? And have any suggestions of what could it be maybe a valve adjustment? Please i would really appreciate it thank you

[@SGFeLLoN]

Ive replaced the oil and bought a new solenoid and im still getting the code

[@BulletSolano]

Did you reset the light afterwards

[@BulletSolano]

If not reset the light and drive around for few miles to see if the light comes back

[@anthonygarcia2267]

I've done the same thing....will the pressure switch cause a p1259 code?

[@ruffiankickloops]

What if my lead connector that connects to the Oil Pressure sensor breaks off, what should I do?

[@BulletSolano]

Go to the junkyard to get another complete part

[@ruffiankickloops]

@@BulletSolano thanks man!

[@clarenceyoung4701]

I changed my VTech silinoid and changed the oil. It still brings a code around 3800-4000rpm.

[@BulletSolano]

Same code? Check the connector to the solenoid!!

[@DavidPortillo-gc9hj]

Alguien me puede ayudar honda accord 2001 2.3 ya hice todo el proceso pise nuevo y antes la luz se apagaba al rato ensendi a ahora me queda fija 😢

[@BulletSolano]

Posibles causas aceite sucio o bajo, el tubo que recoge el aceite en la tapa de abajo del motor está dañado, aceite muy delgado, pero empieza por eso

[@fabianguitron8006]

How do I know what to change if the oil is good but I have code p1259

[@BulletSolano]

Most likely that the vtec solenoid needs to be replace

[@fabianguitron8006]

@@BulletSolano is it still safe to drive the vehicle?

[@BulletSolano]

Yes but don’t go to hard on it

[@helderyoung848]

I already replace the (v-tec solenoid) honda accord 2,000 changed oil every 1,000 cause become really bad turns black whend get 1,000 millas and i clean the valve now the light steel come on P1259 connection good,continuity good i don't understand what happened

[@BulletSolano]

Sounds like you have and open wire between the pcv and the valve

[@majlej166]

Hi Bullet. Do you recommend replacing with only genuine Honda selnoid? Or is a $50 part ok for the car? Also, can a bad selnoid cause other codes like p0420? Thank you sir

[@BulletSolano]

You can replaced it with a $50 dollar one but probably it won’t last, and if you get a P0420 that’s catalytic converter I think that has nothing to do with the vtec solenoid

[@danielsantana6858]

@@BulletSolano what is the syptom of a bad vct. My car acts like its going to cutt out when i reach 4000 rpm. Thanks

[@danielsantana6858]

@@BulletSolano its a 2001 vtec 2.3 accord

[@BulletSolano]

If your VTC is bad you just don’t get vtec but the problem sometimes is that the engine oil is low!! But in your case maybe is something else like ECU in limp mode or the timing is not right

[@danielsantana6858]

@@BulletSolano i havent messed with timming how can i check if its on limp mode?

[@bflkurby1]

Can I still pass emissions test with this code on?

[@BulletSolano]

If you have a check engine light on I don’t think so

[@bflkurby1]

@@BulletSolano You 100% right...... I just failed an hour ago

[@Charlie-Bee]

​@@bflkurby1how did you fix the issue?

[@Charlie-Bee]

​​@@bflkurby1 changed vtec solenoid already but still getting code. Thinking about changing oil pressure switch or maybe the ecm?

[@lovelyleoday6199]

Ok I have two codes this one and p1751 honda accord

[@BulletSolano]

Transmission solenoids B and C

[@lovelyleoday6199]

@@BulletSolano thank you so much!

[@Headsup9550]

You said that you had no continuity, but your dvm says 0.00 which means that it DOES have continuity. Which are you looking for, continuity or no continuity? If there was no continuity you'd have an infinite reading. Are you confusing the terms resistance and continuity? If you're looking for a value on your dvm, that would be a reading of resistance, not continuity..

[@BulletSolano]

Hi I think I get the terms confused but I was looking for continuity which I know I have because the valve is working just fine, thanks for that

[@Headsup9550]

@@BulletSolano I see what you're saying, I was just confused because you said you had no continuity when the pressure switch showed continuity. Not trying to bust your balls because you used the wrong term, just clarifying. Obviously I've got a p1259 problem or I wouldn't have found the video in the first place, so I'm not trying to act like I know all.. lol

[@BulletSolano]

Ok man no problem thanks for that