Identifying a duff lambda

[N88888_dawg]

I keep getting dtc light. Checked using my cobb and it mentiones no signal from a pre cat lambda.
Doesn't say which one....... Useful. Any suggestions folks?


I also had a dtc a few days ago which I cleared to see if it would come back, which said bank 1, sensor 2 lambda was duff too, but that hasn't reappeared. I'm confused slightly now

[135Pats]

I’m not familiar with “duff” but I’m assuming it means “nonfunctional”.

DTC light? Do you just mean traction assist is cutting in and closing the throttle plate? That would have nothing to do with any type of wideband issue.

If you are throwing pre-cat lambda codes, at least one of your widebands is probably out or failing. I would just replace both banks, but if it’s only throwing a bank 1 code, you don’t need to replace the rear turbo bank’s wideband.

[N88888_dawg]

Duff is non functional, correct.

Dtc is an error code.

Looks like I'll be replacing both the sensors when I fit downpipes then