P1090 Diagnostic Trouble Code

P1090 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 P1090 diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
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

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
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.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

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. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

Process Tips

Diagnostic trouble code P1090 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 P1090.

Fortunately, P1090 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1090 Trouble Code For Specific Cars

P1090 Mitsubishi Field Guard Autolamp Delay Decrease Circuit Short To Battery
P1090 Citroen Ln
P1090 Mercedes C 320 ABS Inlet Valve Coil LR Circuit Short To Ground
P1090 Volkswagen Caddy 2 RESCU/VEMS Input Circuit Open
P1090 Ford Windstar Motor # 2 Input Circuit Failure
P1090 Giannini 1000 Oil Change Reset Button Circuit Short To Battery
P1090 Monteverdi Tiara Battery Saver Power Relay Circuit Short To Battery