B0901 Diagnostic Trouble Code

B0901 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 B0901 diagnostic trouble code may include:

Faulty O2 Sensor
Lack of power
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
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.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code B0901 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 B0901.

Fortunately, B0901 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0901 Trouble Code For Specific Cars

B0901 Rover Vitesse Ignition Key-In Circuit Open
B0901 Opel Vectra B Door Handle Switch Circuit Short To Battery
B0901 Tata Indica Mirror Passenger Vertical Feedback Potentiometer Circuit Failure
B0901 Mercedes-benz M Class Air Suspension Front Compressor Relay Circuit Open
B0901 Riley Pathfinder Hydraulic Clutch Actuator Valve Signal Fault
B0901 Salmson 18 Illuminated Entry Input Circuit Failure
B0901 Renault Eighteen Gear Shift Position Control Error