ANSWERS: 1
  • I am an engine mechanic. For a VERY LONG time, my experience (& many others) has been that, if a 'trouble code' indicates a bad O2 sensor, it isn't. Rather, it is a vacuum problem, gen'ly. a loose/disconnected vacuum hose thru which the engine 'sucks' too much air, causing the O2 sensor to 'throw a code'. By merely replacing the sensor, you have only 'killed the messenger', & not corrected the underlying problem (ie, the vacuum leak). It can be tedious, but ALL vac. hoses must be ck'd. & replaced as necessary . O2 sensors themselves RARELY 'go bad'. (there should be a vac. hose diagram on a sticker on the underside of the hood).

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