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 Lancia Y10 STEERING Wheel Angle 1and 2 Signal Faulted
P3142 Volkswagen Schwimmwagen SAI System Monitor Circuit High Input
P3142 Chery Fulwin 2 Downstream Heated O2 Sensors Swapped
P3142 Ducati Monster 797 Illuminated Entry Input Short Circuit To Battery
P3142 Rover P4 Ignition Coil Secondary Circuit Failure
P3142 Saab 99 Ignition Tach Circuit Short To Ground
P3142 Ford Tickford Mirror Switch Assembly Circuit Failure