MOT failure - Catalytic converter lambda sensor readings
Discussion
Any of you guys ever had an MOT failure due to lambda sensor readings ?
I've got the DAE power upgrade which has the different headers, cats and remap.
These have been fitted for years and always passed the emissions previously.
For info, allowance is 0.97-1.03 and mine were reading 1.164 (Fast idle) and 1.172 (Second fast idle). NOTE: MOT done at AM Dealer, so they knew the car needed to be 'hot'.
Not sure the best way to understand what can be done to fix.
Any advice appreciated before I start removing the cats.
I've got the DAE power upgrade which has the different headers, cats and remap.
These have been fitted for years and always passed the emissions previously.
For info, allowance is 0.97-1.03 and mine were reading 1.164 (Fast idle) and 1.172 (Second fast idle). NOTE: MOT done at AM Dealer, so they knew the car needed to be 'hot'.
Not sure the best way to understand what can be done to fix.
Any advice appreciated before I start removing the cats.
Perhaps they could tell you whether you have a dodgy sensor or a dodgy cat. Quite a difference in price I would imagine.
It brings back memories I can now laugh about, namely my first and last dealing with Scrotum Motor Company, who tried analysing lambda sensor data to fix my gearbox... but take pity on them, it was the only data they managed to find in a week. Moral is - just because they say they're good, they may not be.
It brings back memories I can now laugh about, namely my first and last dealing with Scrotum Motor Company, who tried analysing lambda sensor data to fix my gearbox... but take pity on them, it was the only data they managed to find in a week. Moral is - just because they say they're good, they may not be.
Was the car actually hot when they tested t? Had the car been in frequent use?
I’ve had a similar issue recently (not the Aston, but very similar mods - no primary cats, 100 cell sports cats, etc) but it’s not been driven much. They said to take it for a good run and bring it back and they would retest it. Did exactly that, full filled up with fresh fuel. I’d see if you can get it booked in somewhere else, so it can be tested as soon as you bring it in after a very long run.
I’ve had a similar issue recently (not the Aston, but very similar mods - no primary cats, 100 cell sports cats, etc) but it’s not been driven much. They said to take it for a good run and bring it back and they would retest it. Did exactly that, full filled up with fresh fuel. I’d see if you can get it booked in somewhere else, so it can be tested as soon as you bring it in after a very long run.
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