P1A87 Diagnostic Trouble Code

P1A87 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 P1A87 diagnostic trouble code may include:

Faulty or damaged wiring
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Poor fuel economy
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. 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.

Process Tips

Diagnostic trouble code P1A87 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 P1A87.

Fortunately, P1A87 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1A87 Trouble Code For Specific Cars

P1A87 Toyota Conquest O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)
P1A87 Vauxhall Firenza Pressure Control Solenoid A Control Circuit / Open
P1A87 Bmw Isetta Closed Throttle Position Switch Malfunction
P1A87 Lexus Is250 TCM Power Relay Sense Circuit High
P1A87 Nissan Grand Clutch Position Sensor Circuit Malfunction
P1A87 Audi Variant Audio Rear Integrated Control Panel Unit is Not Responding
P1A87 Hyundai Tucson SCP (J1850) Invalid or Missing Data for Engine Coolant