I’ve got a 2000 VW Lupo 1.4 automatic. (It’s a smaller hatchback version of the Golf). Acceleration is a bit sluggish and the gas mileage is a bit lower than it should be, compared with other Lupos. Combined mileage is about 31miles/US gallon. I’ve been doing the usual things to improve gas mil…

My advice is, unless you have real proof the O2 sensor is the problem, don’t ask for trouble. Leave it alone.

[image] Matzoh_Man: The question now is should I clean the downstream O2 sensor? It’s the upstream sensor that affects mileage, driveability, and emissions. The downstream sensor only exists to validate proper catalytic converter operation.

Thank you for this. Is the upstream O2 sensor the one attached to the exhaust manifold?

Yes, the upstream sensor is the one on the exhaust manifold. Yosemite

Just curious. How many miles has that upstream sensor been in there? Is there a reason you’re trying to clean it rather than just replacing it?

You’re assuming the O2 sensor is the reason for your problems. I doubt seriously that it is. I wouldn’t touch it without first running a curve on its output signal. If it were out of spec it’d be tripping a fault code. I’d’ start by assessing the engine’s overall condition with a compression test. …

Agree with the others. But if you do remove it, replace it with an identical new unit. I wouldn’t try cleaning it, I doubt that would do any good, could do harm.

[image] texases: if you do remove it, replace it with an identical new unit. I wouldn’t try cleaning it, I agree. the requisite %&$#@ ten characters.

Thank you. I’ll ask my mechanic to check the compression.

Necessary to clean O2 sensor?

Maintenance/Repairs

Matzoh_Man July 7, 2017, 1:04pm 7

If I can believe the odometer the car’s got about 50,000miles on it. I’m inclined to clean rather than replace the O2 sensor only because cleaning is cheaper, easy to do and, from the advice I’ve gotten, works perfectly well to restore the sensor, assuming you’re starting out with one without defects.

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Necessary to clean O2 sensor?

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