lambda 1 sensor and AFR 2468

[mudstud]

MIL light flashed at me, I hooked up the diagnostics to it and it logs a fault on the Lambda 1 sensor and AFR 2468. While I await Joolz getting back to me, anyone know if the Lambda 1 sensor serves the 2468 side of the engine and how easy is it to replace a lambda sensor?

By the way was the first time I have used the diagnostics. Bought a cable to connect to laptop and connected to ECU and all the info came up without having to mess about with settings etc, very impressed.

[joospeed]

you have two different faults there .. lambda one is bank 1357..

[darreni]

Unless someone has cross wired the sensors?

[joospeed]

nopies, the ecu can't tell you've swapped them over, if the faulty lambda is responsible for the afr fault it's still show as the same bank on the laptop .. if the two faults are shown on different banks then there's two separate faults present... there has to be a fault detected on the lambda sensor, and there has to be a fuelling fault for the afr to register it.

If the lambdas are swapped over you get the weak side going weaker and the rich side going richer, both banks then show afr fault and the adaptives will show the trend of all sites one bank rich plus 30% and all sites weak on the other bank minus 30%.

if the lambda were to be responsible for the afr fault on this car then the faults would both be on the same bank as far as the laptop was concerned, but not as on the car .. it's good but not that good!!

[Julian64]

Hmmm two faults developing simultaneously. I think I would replace the faulty lambda first and see what happened. May be you have two faults developed but I would plumb for some sort of knock on effect.

[joospeed]

the other thing of course i think is that mudstud has a 4.5, which often throws up afr faults when the trimmng is right on it's weak or rich limit .. the 4.5 is much worse than the 4.2 in that repsect, it may be that changing the lambda and resetting the maps clears both fault codes, but chances are the afr migh come back even though the engine appears to run normally ..

the 4.5 inlets aren't as bad as initial looking would have you believe, but it's no match for the 4.2 set up for response and ease of set up (or airflow funnily enough ..)