B0520 Diagnostic Trouble Code

B0520 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 B0520 diagnostic trouble code may include:

Corroded or damaged connector
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Lack of power
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.
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 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. 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. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code B0520 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 B0520.

Fortunately, B0520 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0520 Trouble Code For Specific Cars

B0520 Fiat Supermirafiori Left Front Center Sensor Circuit Fault
B0520 Holden Jb Power Sliding Door Override Switch Input Ckt Short to Gnd
B0520 Holden Premier Power Supply Sensor Circuit Short To Battery
B0520 Beijing Bj 2020 B Camshaft Position - Timing Over-Retarded (Bank 1)
B0520 Izh Oda Seat Direction Switch Assembly Circuit Short To Ground
B0520 Ford Flex Mirror Driver Down Circuit Open
B0520 Saab 92