B0758 Diagnostic Trouble Code

B0758 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 B0758 diagnostic trouble code may include:

Faulty or damaged wiring
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Poor fuel economy
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. 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.

Process Tips

Diagnostic trouble code B0758 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 B0758.

Fortunately, B0758 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0758 Trouble Code For Specific Cars

B0758 Peugeot 405 EGRV Circuit Malfunction
B0758 Opel Zafira Door Lock Cylinder Circuit Open
B0758 Horch Sachsering RF PARK LAMP OUTPUT CIRCUIT Short to Battery
B0758 Porsche 996 Fuel Level Sensor Circuit Range/Performance
B0758 Jaguar Xj-7 Seat Driver Front Up/Down Motor Stalled
B0758 Dkw Standard Ignition Coil - Cylinder 5 - Early Activation Fault
B0758 Lotus M Traction Control Motor Potentiometer Circuit Short to Ground