P1B7E Diagnostic Trouble Code

P1B7E 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 P1B7E diagnostic trouble code may include:

Lack of power
Faulty O2 Sensor
Poor acceleration
Reduction in engine performance, especially at low RPM levels

Possible Causes :

A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Some aftermarket accessories and performance modifications
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

Repair Processes :

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. 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. 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.

Process Tips

Diagnostic trouble code P1B7E 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 P1B7E.

Fortunately, P1B7E is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1B7E Trouble Code For Specific Cars

P1B7E Dacia Duster Fuel Temperature Sensor #2 Circuit Short to Ground
P1B7E Tvr V8 Power Steering Pressure Sensor Circuit Range/Performance
P1B7E Oldsmobile F-85 Cylinder 9 Injector Circuit Low
P1B7E Triumph Italia PATS Is Disabled (Check Link Between PATS And Transponder)
P1B7E Nissan Teana Cylinder #1 High To Low Side Open
P1B7E Fiat 1400 Lack Of HO2S Switch - Adaptive Fuel At Limit
P1B7E Armstrong Siddeley 20 Air Suspension LR Height Sensor Circuit Short To Ground