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I guess I should start by saying the code did not say the sensor was bad. It probably said the sensor signal was out of range. If replacing the sensor fixed the code but the engine still runs rough and stalls, it could be a leaking injector or a problem with the throttle body. You would need to know which cylinder is causing the miss.
P0302: Cylinder #2 misfire. P0171: System too lean, (bank 1) The first may be a bad spark plug or the wiring to it. If it has been some time since the engine has had a tuneup, change all spark plugs and plug wiring. Check the air cleaner and replace if dirty. If it runs much better, recheck the codes again. If the car has 100k miles or over, it wouldn't hurt to replace the O2 sensors as they do wear out (even though the codes don't show that at this time). Replace the fuel filter as well. Running some injector cleaner through in the fuel will help too. If still having problems, check the system fuel pressure as the pump may be on the verge of failing. Again, the codes don't show this as a problem yet. Good luck.
The check engine light appears to alert you that the computer has noted a fault in one of the car's systems. Take the car to an autoparts store and have them scan the computer for fault codes stored. Most parts stores will do the scan for free. Getting the codes will show what problem/potential problem the computer has identified. Hope this helped and best wishes.
It seems this is a fuel problem from the description I get on my scanner for these codes. Is there any way I can get a more in depth explanation than just what shows on the scanner exp. (P0125 closed loop fuel insufficent coolant temp).Changing gas cap and plug wires solved nothing.
P-0125 indicates that your thermostat is sticking open. The engine is not warming up enough to change from OPEN loop to CLOSED loop.
P-0171 indicates that you have a dirty MASS AIR FLOW SENSOR.
Replace the thermostat, and clean the MAF. Then clear the codes and drive it, and recheck for any codes.