SOURCE: MIL light on
P0139 Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) Slow Response This is the Catalytic Converter efficiency monitor, it is reporting that the Cat Conv is not working as it should (cleaning up the exhaust), how many miles on the car?
SOURCE: P0134 Error Code
The code refers to an oxygen sensor that is no longer detecting changes in fuel delivery by way of sensing exhaust oxygen content. Bank 1, sensor 1, tells you which sensor is bad, in this case, it's the sensor that is mounted before the catalytic converter, on the rear bank of cylinders as you look into the engine compartment. It would really be a good idea to change both pre-cat O2 sensors at this point as they are both twelve years old.
SOURCE: 2.0 engne - errors codes p0134, p0172, p1128. What is the problem and how od i fix it?
Trouble Code: P0134
HO2S (Bank 1 Sensor 1) Circuit No Activity
Possible Causes:
Leaks present in the exhaust manifold or exhaust pipes
HO2S signal wire and ground wire crossed in connector (voltage jumps)
HO2S element is fuel contaminated or has failed
ECM has failed
Trouble Code: P0172
Fuel System Too Rich (Cylinder Bank 1)
Possible Causes:
Camshaft timing is incorrect, or the engine has an oil overfill condition
EVAP vapor recovery system failure (may be pulling vacuum)
Fuel pressure regulator is damaged or leaking
HO2S element is contaminated with alcohol or water
MAF or MAP sensor values are incorrect or out-of-range
One of more fuel injectors is leaking
Trouble Code: P1128
Long Term Fuel Trim Add. Air. Bank 1 System Too Lean
Possible Causes:
Fuel pressure is too low or fuel quantity supplied is too low
Fuel filter faulty
Transfer fuel pump has failed
Fuel injector is faulty (sticking or not opening)
Engine speed (RPM) sensor is faulty
MAF sensor circuit open
MAF sensor circuit shorted to ground
Air leak in the manifold
Secondary air injection system combi-valve stuck open
Secondary air injection system electrical short
ECM has failed
SOURCE: O2 Sensor replacement
most cars have only 2 o2 sensors one is below the exaust manifold and the other one near the catalytic converter
SOURCE: trouble code p0134 and p0171
A code P0134 may mean that one or more of the following has happened:
Possible Solutions
The most common fix is to replace the oxygen sensor. But that doesn't rule out the possibility of:
A code P0171 may mean that one or more of the following has happened:
Possible Solutions
Possible solutions include:
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