Remembering why I
dislike working on
AO Silver Member
Join Date: Sep 2001
Agree a leak is more likely....
...but in case it ever helps, a fairly simple test for a Lambda just needs a cheap DVM. Track down the signal wires, dab the DVM across them then run the engine (leave the probe properly connected to the car). Once it's warmed up for a few moments, you should see around 1v to 4v on it. Blip the throttle, as long as the voltage reading swings quickly then settles back to a stable-ish figure, it's probably OK. If it doesn't change voltage, could be a heater supply problem, if it's very slow to react, it's probably poisoned and needs replacing.
Lots of things can damage a lambda. Leaded fuel poisons them fairly quickly, the wrong sort of silicone gasket sealant used almost anywhere on the engine can poison them sooner or later.
Good chance of a trouble light if the probe has gone as well.