Can you recommend a good aftermarket oxygen sensor for 02 lancer?

 

Bosch

 

i got the denzo and i think it was fine

 

I agree with green bandit, go with bosch. A few yrs back I would of said a different company for the downstream one. back then it was $300. But they are around $90 for downstream now and $60 for the upstream. Make sure to get exact fit and not universal

 

This will get rid of the P0421 code that is flipping?
Trying to pass smog and the code keeps turning on, I switched the front o2 but it still getting a check engine light. Getting the second o2 tomorrow and replacing that.
Hopefully that fixes it. Any other ideas if that doesnt work? Everything is stock.

 

There is a recall for the warm up catalyst. call your dealer and see about getting it reprogrammed

 

it is a wrong code the ECU, I am with the same problem, but with a new ROM will be solved,
by the way if anyone has a ROM for lancer OZ 2003 and it doesn't have the code error it will be great for me!

 

I called the dealership and they said there were no open recalls for my car.
I was running a testpipe for 2 years so Im going to bet the rear o2 is shot.
Replacing that today. Hopefully it fixes it.

 

ok luck Man

 

I just got a Denso O2 Sensor (upstream) at Advance Auto Parts through online purchase. I got the direct fit for $64.99, less $20 for the online code discount plus $10 mail-in rebate. The total cost $38.92 after mail in rebate.

 

^ this

 

I got the o2... put it in and its still throwing the code...

 

Which o2 sensor? there are two.

 

I replaced both. Front and Rear

 

How do you flash the ROM to the ECU? What equipment do you use?