I have a 2002 civic si...I got the car a few months ago with a check engine light...I check the car with and OBD2 scanner...it gave a code for secondary 02 sensor...I replaced the sensor with a Bosch sensor from autozone...I reset the code and turned the car on...the check engine light went away for about 10 minutes and came back on...it's for the sensor again...what should I do now? The car bogs sometimes and gas milage sucks...will o2 sensor cause these problems? The car is almost stock just has and HKS short ram intake...thanks

 

if the code is P0420
try changing your catback

 

The code i retrieved is p0141....bank 1 sensor 2 heater malfunction

 

are you running a catalytic converter? i know i just replaced my sensors before inspection and run no cat with a O2 sensor defouler on my type s. i get a code that says slow response from sensor two the CEL goes on and off all the time.

 

Yes I am running a cat...I have been reading other posts...could it be that I am using a cheap universal o2 sensor?

 

Yes. The ECM is looking for a specific signal, which the spliced-in universal sensor is not providing. The heater circuits in these cars are pretty sensitive.

Pick up a Denso 234-4122. Looks like it's $44 on Amazon.

 

Good Job Targa

May I add also the NGK one will work great too!

 

Thanks for the info...I will order one on payday Friday...and will post results