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Second, there was a recall on the sensor, so why don't you ask to do have it done under the recall. As well, does any know of a manual, or set of instructions I can get my hands on to help out with this.įirst, are you sure you want to do it yourself, especially since the access is very hard unless you have a lift (this is why you are not finding it easily)? Would the person who posted the ealier message asking a similar question please tell me if they were successful in replacing this part. I read the earlier post desribing where to locate the sensor, and I have to admit, it is not abundantly clear where and what I should be looking for. I am fairly adept at wrenching, but am clueless about replacing this thing myself. I have taken it to the dealer thinking this part would be covered by extended warranty, no such luck. That allows the sensor to get up-to-speed and begin operating more quickly.I too have a 2001 forester (just a few months out of warranty) and for the second time in the last 5,000 miles the O2 (front) sensor is beginning to deteriorate. When you first start your engine when it’s cold, the heater element gets the sensor nice and toasty. Oh, and one more thing – most modern oxygen sensors have built-in heaters. The rear sensor has very little, if any, input regarding fuel control. On the other hand, the rear oxygen sensor (also known as a downstream oxygen sensor) primarily monitors the performance of the catalytic converter. Then, it adjusts fuel delivery accordingly. The computer uses information from the sensor to estimate the engine’s air-fuel mixture. In case you were wondering, the catalytic converter, which is located in the exhaust system, is an emissions control device that cleans up the fumes leaving your engine.Īnyhow, the front oxygen sensor (also known as an upstream oxygen sensor) is a key input to your car’s computer for fuel control. Most modern cars have at least two oxygen sensors: one before the catalytic converter and one after the catalytic converter. Yep, the sensors calculate the amount of oxygen in the exhaust stream, then share that information with your car’s main computer. This might blow your mind but…oxygen sensors (O2s) are sensors that measure oxygen.