P1945 Diagnostic Trouble Code

P1945 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 P1945 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
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
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for.

Process Tips

Diagnostic trouble code P1945 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 P1945.

Fortunately, P1945 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1945 Trouble Code For Specific Cars

P1945 Merkur Xr Air Suspension RF Air Spring Solenoid Output Circuit Short To Battery
P1945 Alfa Romeo 159 ABS Outlet Valve Coil RR Circuit Short To Ground
P1945 Mercury Lynx Air Suspension LR Height Sensor Circuit Open
P1945 Vauxhall Astra G Powertrain DTCs Available in Another Module
P1945 Nissan Grand Clutch Position Sensor Circuit Malfunction
P1945 Fiat Brava Lamp Headlamp Input Circuit Open
P1945 Fiat 2 Lack Of HO2S22 Switch - Sensor Indicates Lean