P0871 Diagnostic Trouble Code

P0871 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 P0871 diagnostic trouble code may include:

If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Corroded or damaged connector
Reduction in engine performance, especially at low RPM levels
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Fuel with a large percentage of sulfur will clog the DPF quickly

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. 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 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 P0871 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 P0871.

Fortunately, P0871 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0871 Trouble Code For Specific Cars

P0871 Smart Brabus Lamp ABS Warning Output Circuit Failure
P0871 Italdesign Aspid SCP (J1850) Invalid or Missing Data for Wheels
P0871 Mercedes S 320 Additional Fan Relay Circuit Malfunction
P0871 Fiat 16 Hp Lack Of HO2S Switch - Sensor Indicates Rich
P0871 Proton Saga Flx Fuel System Leak Detected Small Leak
P0871 Suzuki Kei Mirror Driver Down Circuit Short To Battery
P0871 Pininfarina Rosso Evap Emission Control Sys Vent Control Valve Circuit