Hello all. Just joined and own a 2006 2.0L Z4 with Manual Gearbox. Bought the car in the UK last summer and its a great little open top car till now!
It has recently failed the UK annual MOT test on high CO emissions. The car starts well and does 42 mpg at 70 MPH, so I do not suspect fuel injectors, spark plugs or dirty air or fuel filters.
I have always used 99 octane fuel, so don't believe the CATs have been contaminated with inferior fuel.
The diagnostic has come up with 'Lambada sensor - Aging of rear CAT bank.' The aft most sensor fitted to the rear most located CAT (there are 2 fitted in line) has been replaced. This has resulted in slightly less CO emissions, but still too high to pass the test.
I have been in contact with the previous owner regarding this issue. He changed both CATs with non-original parts last year, when the car failed on high emissions. This cured the problem. A year later, the problem of high emissions has resurfaced!
The mechanic is going to put a camera down the exhaust pipe to see if there is any damage to the CATs.
Original BMW sourced CATS are very expensive.
My questions are:-
1. Is it the CATS that are at fault?
2. If so, should I try and source 2nd hand or new non-BMW CATs?
3. Does anyone here have any CATs for sale?
4. Could it be one of the other 3 Lambada sensors? There are 2 fitted to each CAT. The diagnostic has not come up with any error with these other 3 sensors, apart from the rear most sensor that is aging and has been replaced.
Can anybody please help our here?
Thank you for any help/advice.
It has recently failed the UK annual MOT test on high CO emissions. The car starts well and does 42 mpg at 70 MPH, so I do not suspect fuel injectors, spark plugs or dirty air or fuel filters.
I have always used 99 octane fuel, so don't believe the CATs have been contaminated with inferior fuel.
The diagnostic has come up with 'Lambada sensor - Aging of rear CAT bank.' The aft most sensor fitted to the rear most located CAT (there are 2 fitted in line) has been replaced. This has resulted in slightly less CO emissions, but still too high to pass the test.
I have been in contact with the previous owner regarding this issue. He changed both CATs with non-original parts last year, when the car failed on high emissions. This cured the problem. A year later, the problem of high emissions has resurfaced!
The mechanic is going to put a camera down the exhaust pipe to see if there is any damage to the CATs.
Original BMW sourced CATS are very expensive.
My questions are:-
1. Is it the CATS that are at fault?
2. If so, should I try and source 2nd hand or new non-BMW CATs?
3. Does anyone here have any CATs for sale?
4. Could it be one of the other 3 Lambada sensors? There are 2 fitted to each CAT. The diagnostic has not come up with any error with these other 3 sensors, apart from the rear most sensor that is aging and has been replaced.
Can anybody please help our here?
Thank you for any help/advice.