Re: where do I find the downstream 02 sensor on a 2004...
I have no specific model experience but the downstream or diagnostic O2 sensor is generally found screwed into the exhaust system just after the catalytic converter.
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As it is a possibility some vehicles dont run with a faulty cam sensor . But if you are getting a cam sensor fault after head gasket id be rechecking the engine timing .
If you have a 4 cylinder engine then you will only have two 02 sensors 1/1 is upstream and 1/2 is downstream. Upstream is the one closet to the engine and downstream is the one farther away from the engine.
If you have a six OR eight cylinder engine you will have four 02 Sensors. 1/1 means Bank One Sensor One. 1/1 and Bank one means right bank and right bank means the side with the number 1 spark plug. SO, 1/1 means, "Right Bank" Upstream 02 sensor. 1/2 means, "Right Bank" Downstream 02 sensor.
2/1 means, "Left Bank" Upstream 02 sensor and 2/2 means, "Left Bank" Downstream 02 sensor. Hope this helps and please visit my auto-repair-website at: http://www.bigasautorepair.com/
Replacing the o2 sensor if you do it will be around $80.00 . If you have it done probably twice that. Do not get a cheap sensor from auto parts store. Spend the money and get one from the dealership. Or you will be doing the job again. The cheap ones do not last. When it comes to sensors you get what you pay for.
replace sensor...also this car has a duel cam and if timing belt breakes the engine will be toast and is rediculously hard to work on.....sell sell sell
Downstream O2 sensor is after (downstream) the catalitic converter on the exhaust pipe. Upstream O2 sensor is after (downstream) the engine exhaust manifold - before (upstream) the catalitic converter. Upstream O2 sensor controls air-to-fuel ratio to yield a small excess oxygen. Downstream O2 sensor assesses the catalitic converter performance.
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
There is one 02 sensor in front of the catalytic converter (called upstream), and one behind it (downstream). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. In the case where both readings are fairly steady, a P0420 check engine light code is set.
Possible Causes:
Oxygen (O2) sensor not working correctly Damaged or leaking exhuast (pipe, manifold, catalytic converter) Damaged catalytic converter
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