what is oxygen sensor

Asked by Jul 28, 2016 at 02:05 PM about the 2004 Suzuki XL-7

Question type: General

i replace oxygen sensors in my vehicle now not working properly

1 Answer

68,745

The upstream oxygen sensor(s) monitor the level of oxygen in the exhaust gases as they leave the engine. A signal is sent to the computer (PCM) and the air/fuel mixture is constantly being adjusted to maintain a 14 to 1 ratio air/fuel mixture. The downstream oxygen sensor(s) monitor the efficiency of the catalytic converter(s). Nothing else. That's all they do. When replacing an oxygen sensor you must specify whether you want the upstream or downstream oxygen sensor. HTH. -Jim

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