GMC Terrain 2.4 P0420 | $20 FIX !!!

[@OldSoulMillennial]

* UPDATE* The bottle of additive only cleared the code for a few weeks. I Ultimately ended up removing the downstream 02 sensor, and I installed a Spacer (Off road use of course). Here is a link to the spacer: amzn.to/3UQYZvs

[@OldSoulMillennial]

@jrea8401 only do attempt this on the downstream sensor

[@rhurtadorh32]

If you changed the o2 sensor why would you put that spacer?

[@Blblazer1210]

​@rhurtadorh32 the spacer is so it tricks the O2 sensor into thinking the catalytic converter is still working. If the converter is bad, a new O2 sensor won't make the check engine light to go out.

[@OakCliff1226]

When you said "This is illegal" I immediately subscribed to your channel😂😂😂

[@johnmurphy9688]

Me too. I'm subbing now. 😂😂🫡🫡

[@Imliveonstage]

I had the same code just appear. I'm going to try this.Thanks for the good information. 👊

[@OldSoulMillennial]

@@Imliveonstage If this doesn’t work, down stream 02 sensor spark plug Fowler (off road use only). Cough cough

[@Blblazer1210]

Im pretty sure im gonna have to go this route.

[@doncorrell9951]

Is the Terrain still burning oil after the timing chains replacement, or did it get any better?

[@ChristisKing7749]

Timing chains wont change that. Its the piston rings. They make them "loose" for "fuel economy"

[@SG-gc7mn]

I used a spacer, got rid of the p0420, but got p0138 and p013e

[@HTTR_FOREVER21]

Offroad applications 😉 😉

[@HTTR_FOREVER21]

I’ll use the spacer😂😂