Decat with dash light

[Cupman29]

After fitting a Decat the usual warning light came on the dash.

Can anyone tell me if you are actually losing power due to the ecu thinking the cat is Fu*ked and so adjusting the fueling or timing or is it only telling you as a warning?

Got a rolling road session next weekend and can't decide whether to change it back or not for it.

 

[200 Alex]

As far as im aware you dont lose any power mate

 

[robbygraham]

I was thinking the exact same thing yesterday, does the ecu change the fuelling in any way to compensate for the gas mixture in the rear lambda sensor being incorrect.

 

[Cup_Phil]

Nope

ECU uses the first lambda sensor (pre-cat) for fuelling
The only use for the second lambda is to check the emissions are lower than the first - so it knows the cat is working
It's purely to put the light on the dash

 

[Cupman29]

Nope

ECU uses the first lambda sensor (pre-cat) for fuelling
The only use for the second lambda is to check the emissions are lower than the first - so it knows the cat is working
It's purely to put the light on the dash

Cheers mate, that's what I wanted to hear.

 

[Nick172Cup]

Tape the end of the post lambda sensor and stick it above the heatshield. Then just stick a bolt on the lambda hole on the decat, light should go out and run normally.

 

[Jamiehudson]

I was thinking the exact thing but my light didn't come on till about 2500miles after fitting the decat, I will try the solution!

 

[Cupman29]

Mine came on about 800 miles after fitting. I had been on 2 trackdays and on driving home from the second the light came on.

I've got so many lights on my dash now I feel like they all keep me company when driving in the dark nights! :clown: