P1B4A Diagnostic Trouble Code

P1B4A 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 P1B4A diagnostic trouble code may include:

Lack of power
Faulty O2 Sensor
Poor acceleration
Hesitation upon acceleration

Possible Causes :

Some aftermarket accessories and performance modifications
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.
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 :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. 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. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

Process Tips

Diagnostic trouble code P1B4A 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 P1B4A.

Fortunately, P1B4A is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1B4A Trouble Code For Specific Cars

P1B4A Holden Hq Power Door Unlock Circuit Failure
P1B4A Austin A60 Autolamp Delay Increase Circuit Short To Ground
P1B4A Austin-healey 3000 Aux A/C Mode Position Reference Circuit Short to Battery
P1B4A Opel Grandland X Dim Panel Increase Input Circuit Open
P1B4A Packard 300 DPFE Circuit Low Input
P1B4A Toyota Hmv Oil Level Lamp Circuit Short To Ground
P1B4A Gaz 3111 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)