P0687 Diagnostic Trouble Code

P0687 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 P0687 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.
Diminished fuel efficiency

Possible Causes :

Faulty IMRC actuator/sensor
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

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. 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.

Process Tips

Diagnostic trouble code P0687 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 P0687.

Fortunately, P0687 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0687 Trouble Code For Specific Cars

P0687 Nissan Patrol Cooling Fan 1 Control Circuit Malfunction
P0687 Alfa Romeo Crosswagon Accessory Delay Relay Contact Short To Battery
P0687 Lon Boll 12 Timing Reference High Resolution Signal B Too Few Pulses
P0687 Maico 500 Traction Control Valve RF Circuit Short To Ground
P0687 Proton Tiara Fuel Tank Temperature Sensor Circuit Malfunction
P0687 Moretti Spider Boost Calibration Low
P0687 Armstrong Siddeley 16 Air Suspension LR Height Sensor Circuit Failure