Catalyst "on fire" sensor - removal??
03 September 2009, 08:30 PM
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Catalyst "on fire" sensor - removal??
About to do my decat up-pipe 2morow - with this post cat sensor - do I put it back or leave it off - what do you do with it and what are the implications????
advice??
advice??
03 September 2009, 08:58 PM
#4
Because your new downpipe hasn't got a cat in it, then there's nothing for the EGT sensor to measure anymore - it's redundant!
Just leave it soemwhere safe in the engine bay... cable-tie it away from any potential moving/hot parts.
Just leave it soemwhere safe in the engine bay... cable-tie it away from any potential moving/hot parts.
Last edited by joz8968; 03 September 2009 at 09:03 PM.
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04 September 2009, 08:06 AM
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HI sorry to hi-jack thread!!! i've an 53 wrx and want to fit a decat downpipe from the turbo, is this cat heat sensor the one in the middle of the small 'box? i thought it was a down stream lambda sensor? do i have a down stream lambda sensor or can i just de cat and no warning lights will come on? thanks
04 September 2009, 11:11 AM
#12
The Newage does not have a "cat on fire" sensor....it has a lambda sensor in the downpipe which checks for the efficiency of the catalytic converter.
If you remove the cat then the ECU thinks it's not working and throws up CEL P0420 indicating you have a cat / emissions problem. The CEL has no effect on performance, the most effective way is to have the car re-mapped (about £600) which will remove the CEL and free up a significant number of BHP
The alternative is a CEL Fix which sits between the sensor and the ECU sending signals to the ECU to fool it into thinking a cat is still there.....not always 100% effective though as the ECU expects a fluctuating signal.
HTH
Shaun
If you remove the cat then the ECU thinks it's not working and throws up CEL P0420 indicating you have a cat / emissions problem. The CEL has no effect on performance, the most effective way is to have the car re-mapped (about £600) which will remove the CEL and free up a significant number of BHP
The alternative is a CEL Fix which sits between the sensor and the ECU sending signals to the ECU to fool it into thinking a cat is still there.....not always 100% effective though as the ECU expects a fluctuating signal.
HTH
Shaun
04 September 2009, 02:00 PM
#14
Nothing happens apart from the ECU lighting the CEL and storing code P0420. There is no loss of power as the ECU does not see this as a danger to the engine.
The main problem is that you won't know if the ECU has detected anything else as the CEL is lit...........and the light is very annoying !! especially at night ....
Shaun
PS it's also a dead give away at MOT time LOL
The main problem is that you won't know if the ECU has detected anything else as the CEL is lit...........and the light is very annoying !! especially at night ....
Shaun
PS it's also a dead give away at MOT time LOL
04 September 2009, 04:59 PM
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Right - just picked up the scoob and De-cat downpipe now fitted - Its appears that there was only one sensor on the original pipe going into the bottom of the cat (presumably the afore mentioned "cat on fire" sensor. This has been disaconnected and left off completely.
The two sensor holes in the decat pipe have been bunged up tight with the bols that came with it.
Only driven about 5 miles home but the car seems to boost better to 1 bar and theres quite a hiss from the turbo.
Seems all good so far!!
My only question now is - Where the hells the 02 (lambda) sensor???????
The two sensor holes in the decat pipe have been bunged up tight with the bols that came with it.
Only driven about 5 miles home but the car seems to boost better to 1 bar and theres quite a hiss from the turbo.
Seems all good so far!!
My only question now is - Where the hells the 02 (lambda) sensor???????
04 September 2009, 05:07 PM
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quick question if you dont mind me hijacking. is there a sensor on the uppipe?? as im fitting my headers tomorrow and would like to know before hand. my headers have the hole but do i need to refit if there is one. 97 sti
04 September 2009, 05:12 PM
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There was just no other sensor on the original down pipe so I assume the lambda sensor must be on the engine side of the turbo somewhere???
Its could be that yours is like mine maybe and the 02 is located forwrd of the turbo somewhere????
Lots of somewheres???? hahahaha!
Its could be that yours is like mine maybe and the 02 is located forwrd of the turbo somewhere????
Lots of somewheres???? hahahaha!
04 September 2009, 05:27 PM
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Joz - your a star m8 - Iknew Id seen the little bugger when I rebuild the front afrter my Deer incident - Thank you bud!!
So basicly all should be fine and dandy!!!
Has anyone got a pic of a chopped heatshield - loooks pretty straight forward but always good to have 2nd opinion!!!
Dont want much do I....hahahahaha!!!!!!!
So basicly all should be fine and dandy!!!
Has anyone got a pic of a chopped heatshield - loooks pretty straight forward but always good to have 2nd opinion!!!
Dont want much do I....hahahahaha!!!!!!!
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