Civic Type R P0420 code
#1
Civic Type R P0420 code
Have a civic type r 2002 135k on the clock. Fitted an aftermarket cat, and 2 new sensors cleared the code. Now after 3 days the code has unfortunately returned which has gave me a real headache.
When the cat was installed plugged in a laptop with diag software which again showed mirrored fluctuating signals in both o2 sensors in closed loop mode.
Any Ideas out there
When the cat was installed plugged in a laptop with diag software which again showed mirrored fluctuating signals in both o2 sensors in closed loop mode.
Any Ideas out there
#2
Honda-Tech Member
Re: Civic Type R P0420 code
I'd be willing to guess the aftermarket cat is what's causing your ECU to freak out and show a deficiency in your O2 sensor. You might need a defouler to move it away from the stream a little bit.
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