P1111 Diagnostic Trouble Code

P1111 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 P1111 diagnostic trouble code may include:

Reduction in engine performance, especially at low RPM levels
Vacuum leak on the engine
Diminished fuel efficiency
Rich or lean exhaust

Possible Causes :

The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Fuel with a large percentage of sulfur will clog the DPF quickly
Dirty air cleaner element Damaged DPF

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. 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. If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve.

Process Tips

Diagnostic trouble code P1111 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 P1111.

Fortunately, P1111 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1111 Trouble Code For Specific Cars

P1111 Gmc Envoy Park Brake Actuator Assembly Switch Circuit Failure
P1111 Buick Velite Damper LF Circuit Short To Battery
P1111 Maserati Mistral Transmission Fluid Pressure Sensor/Switch F Circuit Range/Performance
P1111 Geely Hq O2 Sensor Signals Swapped Bank 1 Sensor 1/ Bank 2 Sensor 1
P1111 Opel Meriva A Door Ajar Circuit Short To Ground
P1111 Perry 11.9 Dual Alternator Lower Circuit Malfunction/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage
P1111 Morris Mini Moke Brake Switch Out Of Self Test Range