Hi just fitted a new denso o2 sensor to cure my hesitation/surging. Drove the car all last night and was fine but now i have a cel light up on the dash even though the car runs fine. Any ideas ??
Car is an 04 wrx running mods.

Thanks

 

Need error code read, could be unrelated

 

Ok cheers, i plan on a trip to the dealer tomorrow as i need some rocker cover gaskets anyway, so hopefully they can shed some light on it. Why do things always happen at once

 

Hi, dealer just read codes and it was the front o2 sensor. He cleared the fault and now it all seems to be fine. Any ideas why it triggered after the new one was fitted??

Cheers and merry christmas

 

Grrrrrr its back on

 

Have you puta de-cat up-pipe on from the manifold to the turbo as tat is what caused my light to come on and even though I replaced the sensor as per Subaru. The light isstill on when I run the OE ecu.

 

Hi yea de cat uppipe fitted but have resistor fitted in place of the temp sensor before the turbo to stop the cel light. The rear o2 has had the codes disabled by the mapper.
The light was not on with the old sensor but the car ran bad, now the car runs as it should but with a cel light, im confused!

 

is the rear o2 sensor fitted?

the ecu alters the fuelling on the front one and uses the rear to check it is doing as it expected.. if the rear sensor isn't fitted the floating value or a resistor on the plug will be valid value and therefore the ecu may throw a front o2 sensor error as the adjustments it is asking for are no see on the rear sensor..

bit of a long short but if rear is removed I expect you have confused it.,


if by rear sensor cels cancelled you meant the cat fail cels and the o2 sensor is still fitted then ignore me.. lol

Was the remap done possibly with the failed sensor? maf scaling could be wrong if setup low down using the front o2 sensor.. many mods fitted? and how long ago was it mapped?


Simon

 

Hi Simon, thanks for the reply, yes i meant the codes, the rear sensor is still in place. The car was mapped over a year ago by Bob rawle and has been perfect untill the last few weeks.
Car is running 350/349ftlb, full 3" de cat, manifold, 18g, sti topmount,550 injectors fuel reg etc
all on 97ron

cheers

 

Ok now im getting anoyed, cel has now gone out but the car runs like poop again, no power off boost and a juddery/lumpy transition between closed and open loop i guess as it comes onto boost. Any suggestions? Car now has new MAF and a new front Lamba sensor!!

Many thanks