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My dad's just removed both Lambda sensors and cleaned them but it's made no difference. He tested the emissions before and after cleaning them but they're still bad. Have you any idea how to test the sensor if it's working without buying a new one?

cheers, Blimey, there seems to be sensors on everything! I'll get all these things checked. The car's recently had a coil pack, new plugs, air filter, oil and filter. So you have to assume it's one of these sensors.

I'll also have him look at the MAP sensor

I know on mine the temperature gauge is fine, and the problem only occurs when it's hot, no engine management light comes on. Mine has stalled when depressing the clutch, for example when you approach a junction or go around a corner, then the power steering will fail as it's stalled. It also...

Thanks Alan, Do you think this could be the problem? Just noticed on the car's service history it's been cleaned before :approve:

Just reading some of the common problems, could this be a lambda sensor which needs cleaning or replacing? I understand there is either one or two on the 172 series 1?

Hi, I've been recommended to log onto this forum as most people on here are more knowledgeable than my local (useless) Renualt dealer. I have a series 1 172 and recently the idle speed (at warm temperature) has become erratic with the rev needle dropping off the gauge, the car eventually and...