P07B8 Diagnostic Trouble Code

P07B8 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 P07B8 diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
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.
Faulty IMRC actuator relay (if equipped)

Repair Processes :

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. 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. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code P07B8 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 P07B8.

Fortunately, P07B8 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P07B8 Trouble Code For Specific Cars

P07B8 Saab 9-5 Ignition Switch Illegal Input Code
P07B8 Toyota Fk Oil Change Lamp Circuit Open
P07B8 Ford Fairlane
P07B8 Studebaker Cruiser Lamp Turn Signal Rear Output Circuit Short To Ground
P07B8 De Soto De Luxe Hood Switch Circuit Failure
P07B8 Brasinca 4200 Convertible Top Up/Down switch Fault
P07B8 Lagonda Rapier Shift Solenoid E Control Circuit Range/Performance