The autozone technicians tell me that my 2011 HHR 2LT has 3 O2 sensors parts numbers 213-3011 and 213-3138 and 213-4195 so pleas where is the location of thees sensors

Almost always cars have 2 sensors, Upstream or (o1 Sensor) and Downstream or (o2 Sensor). The first sensor will be at the front of the engine at the exhaust manifold and the second will be near you catalytic converter. o1 measures fumes coming out of the engine. o2 measures fumes reaching the exhaust pipes. Hope that helps.

You might also want to take a look at 2011 Chevrolet HHR camshaft sensor location Google Search

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Outside Temperature Sensor - Chevy HHR Network

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Definition of Diagnostic Trouble Code P0171 Category: Powertrain Definition: System Too Lean Bank 1Note: This definition of P0171 is applied to all manufacturers

passenger o2 sensor,replace it

You will need to find the trouble code for malfunctioning wheel speed sensor. The Powertrain control module thinks that there is a wheel spinning or slipping, which in turns retards ignition timing to limit the slip. It could be a bad sensor or a broken wire harness. Some parts houses can give you the code, but you will either have to take it in to a Certified Technician, or diagnose it yourself if you are qualified.

Code 54 is for a problem with the heater circuit for the O2 sensor that is mounted after the catalytic converter. The problem could be the sensor or the wiring for the heater circuit in the sensor. The circuit would need to be tested.

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I can help you , i need the year ,make and nodel and engine size of this car and also can you get the code numbers that auto zone got as codes. the heater is part of the o2 sensor, may may only have one bad one but i need the code or codes to tell you which one it is.

Take the car to Autozone for a free scan and try to get more specific identification of the cylinder number and the bank number for the O2 sensor. I would go after the misfire problem first to see if that cleared the O2 code. Hope this helps!

it is usually one of the O2 sensors is bad/i had the same problem with my 2001 dodge grand caravan sport/it may not be the muffler or the catalytic converter necessarily. take the car to either autozone or oreilly's and have them put the engine code reader on it/its free and only takes a minute/ my car has (2) O2 sensors. it would be best to give your VIN number to the dealer so they can tell you which of 4 possible O2 sensors you will need. then you can compare and shop online for the part. Some O2 sensors have 2 wires, some 3, and some 4 so there isn't just 1 part it could be. some O2 sensors also have very short wiring harnesses, so if you get one, make sure the wiring on it is long, not short, or the mechanic is going to have to rig it to make it work.