How many o2 sensors does my 2003 toyot a corolla have? And where are they located

change coolent temp sensor.

DTC P0171 is set when fuel trim is driven rich beyond a certain value. Possible causes are:
1. Exhaust system leak.
2. Improper fuel pressure.
3. Fuel injector restricted.
4. Defective heated oxygen sensor No. 1.
5. Defective Manifold Absolute Pressure (MAP) sensor.
6. Defective Engine Coolant Temperature (ECT) sensor.

System Too Lean. This code will set when an air fuel ratio sensor (O2 sensor) gets lazy.

Also, check for a vacuum leak on that side.

your local auto parts store like autozone sells mirror glue to re-attach the mirror to the windshield. Less than 5 dollars.

Depending which O2 sensor it is, it will be located after the exhaust manifold before or after the Catalytic Converter.

THAT is false you have to get your obd11 code erease witch a code reader or a scan tool and after that everithing should be ok

It will be just after the catalytic converter in your exhaust.

on the exhaust manifold

should be a bolt on for service ability

All corolla's have drum brakes. What you have to do is to take the rear wheels out pop a little rubber plug from the hub and insert an adjusting tool to rotate the adjusters.

ITS VERY EASY, DISCONNECT THE NEGATIVE BATTERY, UNPLUG THE O2 SENSOR WIRE PRESSING THE TAB AND USING A 22 mm. WRENCH LOOSE THE SENSOR LIKE A BOLT