P142A Diagnostic Trouble Code

P142A is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a P142A diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.

Repair Processes :

It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.

Process Tips

Diagnostic trouble code P142A is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P142A.

Fortunately, P142A is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P142A Trouble Code For Specific Cars

P142A Fiat Twelve Left Front Sensor Circuit Short to Vbat
P142A Citroen Jumper Fuel Pressure Regulator 1 Performance
P142A Toyota Iq Oil Level Switch Circuit Open
P142A Chrysler Town Exhaust Pressure Control Valve Intermittent
P142A Honda Cr-v Pressure Control Solenoid Performance or Stuck Off
P142A De Tomaso Bigua Horn Relay Coil Circuit Short to Vbatt
P142A Daf 66 Gear Lever Y Position Circuit Intermittent