4 replies to this topic

[pjm]

The story so far: I fitted a new exhaust (Maniflow lcb and play mini exhaust) recently, now the car fails on emissions, at the first test centre it failed on natural idle high co. Took it to a different garage to have the ecu read, which showed no faults but they passed nat. idle test, but failed fast idle on hydrocarbons and lambda. I inspected the cat and found half the insides missing, so replaced with new, I did re-use the metal gaskets as they were only a month old, and have used exhaust paste everywhere except just before the cat.
The car now passes the hc, but still fails on lamda (measures 1.2). The garage said the lamda sensor appears to be switching ok, I've checked the earth to it (0.1 Ohm) so that looks ok, the sensor is switching between 80 and 200 mV, this should be between 200 and 800 mV shouldn't it? To me this looks to be my problem, the only other thing I can think of is an air leak, I've ordered new cat gaskets and will check all fixings from the manifold back.
Any help please, am I right about the lamda sensor readings?

[AlexM]

Cue Minisprocket....he knows all abaout the injection malarky.

[Sprocket]

did you fit the genuine bosch Lambda sensor.

[pjm]

When I fitted the new system, I just reused the original sensor, as it came out relatively easily, was this a mistake the cars done 70K and is nearly 7 years old?

[pjm]

Rebuilt the exhaust, can't find any leaks on it, ordered a new oxygen sensor which I'll fit when I get chance, to see if that works, could it be a leaky vac. pipe?