P1987 Diagnostic Trouble Code

P1987 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 P1987 diagnostic trouble code may include:

Vacuum leak on the engine
Reduction in engine performance, especially at low RPM levels
Engine surge
Poor acceleration

Possible Causes :

Dirty air cleaner element Damaged DPF
A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

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. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code P1987 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 P1987.

Fortunately, P1987 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1987 Trouble Code For Specific Cars

P1987 Cadillac Model A Digital TRS Failed to Transition States in KOEO / KOER
P1987 Vauxhall Insignia Pressure Control Solenoid A Control Circuit Low
P1987 Saturn Vue Inertia Switch input Circuit Open
P1987 Lancia Alpha Speed Wheel RF Input Signal Missing
P1987 Bmw R-nine T Clutch position ckt short to ground
P1987 Subaru 1600 Lateral Accelerometer Signal Fault
P1987 Lmx Sirex through P0580 Reserved for Cruise Codes