C1/107/Aygo - Fitting a new catalytic converter

This week’s video is one that’s been on the cards for a while now, I just never got around to it until now. A while ago, I made a temporary fix to my exhaust because the threads at the bottom of the catalytic converter (where the centre section bolts onto the bottom of the cat) had previously been cross threaded, so the threads have now been stripped away. To fix this, I could have welded the holes up, re-drilled them and tapped the holed, but that’s far too much effort! I instead ended up finding a replacement cat (an OEM one, not an eBay one). Therefore, today’s job is to replace the catalytic converter with another one, so the bolts can be done up correctly and seal the exhaust leak.
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[@flippingcarsrepairs]

Just did mine no need to take the alternator of 👍

[@DABDIY]

You can do it with the alternator in place, but it certainly makes access a lot easier with it out of the way.

[@vincehoffman179]

I purchased a daihatsu cuore Vii just a month ago and now the flange where the cat meets the exhaust has literally rusted off. my guess is that water got trapped bc of the edges being curved up. anyways gotta weld the flange to the cat now or let someone else do that. but I will take your video as a guide to fix my problem. Do you have the torque specs of all the bolts or a link to the service manual\? thanks in advance *I just rewatched it and heard you say 24 Nm 👍👍

[@ColinMcDonnell-q2t]

Just wanted to ask if you remapped or chipped your Citroen C1 if so is it worth doing and how much performance do you get from it thank you

[@DABDIY]

I haven’t and I probably won’t until I’ve completed the turbo build because the gains will be marginal and not worth the money.

[@froll-55]

Здравствуйте. Какой пробег у машины? Какая причина замены катализатора?

[@atoyran6584]

Hii please help me. The interior of my c1 smells like burned oil or gas. I checked everything. There is no leak anywere whatsoever, but the smell keeps coming when i turn the vent on. What the hell is happeninggg

[@DABDIY]

Have you checked all around the outer surface of the catalytic converter? It’s not uncommon for them to crack and leak exhaust gasses.

[@atoyran6584]

@@DABDIY i cant find anything. But when i ride for 15 minutes and pop the hood open. I get this strong burned fuel/oil smell. Its coming from the catalystic converter. Because the other locations near the motor dont smell so strong. Is it maybe better to buy a new catalystic ?

[@DABDIY]

@atoyran6584 it might be time for a new cat, but don’t quote me on that.

[@gabrielkjellgren7567]

@@atoyran6584i could not see it but when i took my cat off the exhaust manifold had completely rusted apart, and I also had that smell. Need to hange it probably

[@stefanspaan2223]

How long does it takes to change de katalysator? From begin to end?

[@DABDIY]

About an hour if all the nuts and bolts behave themselves.

[@dutchboy831]

@@DABDIY Is it necessary to remove the bumper radiator etc? Thanks mate

[@DABDIY]

@dutchboy831 it certainly makes life easier

[@flippingcarsrepairs]

​@dutchboy831 i would you can do it with out but its alot tighter

[@petersomthing9508]

Christmas Eve had to put new exhaust on my Daughters toyota aygo for the mot she lives away and was only here for 2 days same thing happened threads went on one side of the catalytic converter so had to put just a bolt and nut on it but passed the mot, will re-thread drill and tap easy to do from under the car next time she here , needs a proper bolt with spring old one will be no good hole diameter will be bigger

[@DABDIY]

If you can get it to tighten up and not leak, you’re on to a winner there 👍🏻

[@olegfiesta7685]

how much did you pay for the catalyst? and where did you order?❤❤❤

[@DABDIY]

I don’t recall how much, it was a while ago. I bought it from a friend as a used item, I don’t have any links for you or anything like that.

[@matt_corbett]

Just had a new cat fitted, car turns over but will not start, any ideas??

[@DABDIY]

Could be anything! Have you disturbed any earth straps or anything like that?

[@matt_corbett]

@DABDIY I did not do the work, but will ask the question, ty for reply.. I guess it could be a sensor issue of some kind,

[@DABDIY]

@matt_corbett id definitely take it back to the garage that did the work then, it’ll be under warranty.

[@harwoods11]

As I recall most all the nuts and bolts will be totally corroded into place and may well snap upon removal. This will mean stud /bolt removal tools, hardened drill bits and possibly the removal of many more parts to gain better access to retap threads. Not a nice job by any means.

[@DABDIY]

Agreed. I’m under no illusion that I got lucky with this job.

[@flippingcarsrepairs]

Ive just done mine as my manifold on one cylinder has disintegrating bolts were gorroded but but still came out ok 👍 👌

[@arslaansarfraz3251]

Is there anything you can do to stop the cat getting robbed

[@DABDIY]

Not that I’m aware of. This car has the added advantage of the cat being behind the bumper, rather than under the car. That makes it harder to access.

[@gavjlewis]

Could you have not re-threaded the old cat?

[@DABDIY]

I probably could, but that would have involved welding, drilling & tapping or helicoiling. Honestly, it’s not worth t cause I already had a spare.

[@runristaren2]

All you needed was a new fire ring instead of all that crap paste there and you would be fine..

[@ΕλενηΓκέλη-σ2δ]

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