B3129 Diagnostic Trouble Code

B3129 is a kind of OBD-II Diagnostic B-Body 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 B3129 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Rich or lean exhaust

Possible Causes :

The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Fuel with a large percentage of sulfur will clog the DPF quickly
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors.

Process Tips

Diagnostic trouble code B3129 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 B3129.

Fortunately, B3129 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B3129 Trouble Code For Specific Cars

B3129 Rover 420 Ignition Coil B Primary/Secondary Circuit Malfunction
B3129 Renault 45 Hp Gear Lever X Position Circuit
B3129 Jensen Interceptor Seat Driver Recline Rearward Switch Circuit Failure
B3129 Renault Scenic 4 High Mount Stop Lamp Circuit Failure
B3129 Audi 90 Ambient Air Temperature Sensor Circuit
B3129 Plymouth Trail Duster Exhaust Gas Recirculation Circuit Range/Performance
B3129 Bmw M Clutch Actuator Circuit Low