P3142 Diagnostic Trouble Code

P3142 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 P3142 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
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)
Faulty IMRC actuator/sensor

Repair Processes :

Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code P3142 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 P3142.

Fortunately, P3142 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P3142 Trouble Code For Specific Cars

P3142 Austin Seven Aux A/C Blower Speed 2 Circuit Short to Ground
P3142 Marmon 34 Transmission 4-Wheel Drive Low Indicator Open Circuit
P3142 Peugeot 202 ECM Control Relay O/P Circuit Malfunction
P3142 Facel Vega Facel Injector Circuit / IDM Codes Detected
P3142 Plymouth Laser Evaporative Emission Control System Vent Control Circuit Malfunction
P3142 Chrysler Esx Evap Emission Control Sys Vent Control Valve Circuit
P3142 Zastava 2101