P3126 Diagnostic Trouble Code

P3126 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 P3126 diagnostic trouble code may include:

The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Faulty or damaged wiring
Hesitation upon acceleration
Diminished fuel efficiency

Possible Causes :

The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Defective ECU strategies or components will prevent proper regeneration
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

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. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code P3126 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 P3126.

Fortunately, P3126 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P3126 Trouble Code For Specific Cars

P3126 Chrysler Es Evap Emission Control Sys Leak Detected (Gross Leak/No Flow)
P3126 Zagato Hyena
P3126 Ford E-350 Manifold Absolute Temperature Circuit Low Input
P3126 Triumph Herald PATS Ignition Key Transponder Signal Is Not Received
P3126 Moretti Spider Boost Calibration Low
P3126 Chevrolet Camaro 5 Driver Power Window Motor Circuit Open
P3126 Mclaren F1 A/C Refrigerant Pressure Sensor Circuit Range/Performance