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oxygen sensor ( O2) are located after the cat converter
the one in the exhaust manifold is a heated oxygen sensor (HO2S) and is a totally different operation sensor
Bank 1 usaually is the front if this is a 4 cyl, if a 6 cyl, it would be bank 1 which is cyl 1 side, sensor 1 is befor cat converter, sensor 2 is after cat
O2 sensor are located before and after Catalytic Converter ( exhaust system of your car).
If you car's engine is 4 cyl you have 2 O2 sensors and if you car's engine is 6 cyl then you have 4 O2 sensors ( for each bank, 2 for left bank and 2 for right bank).
Hope it helps and comment if you need more advice.
Please don't forget to rate the answer it helps with my ratings, thanks!
B1 means the sensor is located on the same bank of the engine that has the #1 cylinder. B2 is located on the opposite bank.
S1 means the sensor is located BEFORE the catalytic converter
S2 means the sensor is located AFTER the catalytic converter
You didn't say which engine you have, so I've included the diagrams of both 4 cyl and 6 cyl so you can see the banks
BANK 1 SENSOR 1 IS THE ONE IN THE EXHAUST MANIFOLD. BANK 2 SENSOR 2 IS BELOW THE CATALYTIC CONVERTER.
P0171 SHOULD GO AWAY WITH A GOOD O2 SENSOR BUT DO CHECK FOR VACUUM LEAKS TO BE SURE. 3.1/3.4L ENGINES HAVE A BAD DESIGN INTAKE MANIFOLD GASKET, THE LEAK OIL, COOLANT, AND AIR.
Bank #2 referes to the side of the eng in which cyl. #2 is snsr #1 referes to the sensor before the cat. conv. and the code is for a slow response so, basically a lazy O2 snsr. So if you can locate cyl. #2 and follow the exaust manifold on that side of eng. the very first O2 snsr you see is the one in need of diag./repair
There should be two O2 sensors. If you look inbetween the engine and radiator following the exhaust manifold down to the exhaust pipe you should run into the 1st O2 sensor, following the pipe down stream under the vehical towards the catalytic converter you should find the second O2 sensor. The 1st O2 should be easy but the 2nd might be difficult depending on your abilities. Coils will depend on 4 or 6 cyls, 1 for each cyl. Repair man, go to, pep boys, napa, auto zone, advanced auto parts to name a few.
po304 is just that #4 cyl has a problem could be a bad spark plug or a bad plug wire or bolth if it hasnt had an ign tuneup its time. the po138 is just telling you one of the cylinders isnt burning all the fuel put into that cyl. so its just cause and effect. if ya need any more info let me know later paul
That is the first sensor closest to the engine. The downstream sensor is the one behind the converter.
Good luck. Please rate this response , and let me know if ya need more help!
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