B1025 Diagnostic Trouble Code

B1025 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 B1025 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
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.
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 :

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. 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.

Process Tips

Diagnostic trouble code B1025 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 B1025.

Fortunately, B1025 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1025 Trouble Code For Specific Cars

B1025 Ford Corcel MAF Sensor Intermittent/ Check of all OBDII Systems Not Complete
B1025 Jowett 7 Seat Headrest Feedback Potentiometer Circuit Failure
B1025 Vandenbrink Carver Power Window Master Circuit Short To Ground
B1025 Seat 127 Injector Circuit Malfunction - Cylinder 11
B1025 Ferrari 330 Insufficient RMP Increase During Spark Test
B1025 Citroen C15 Front Washer Input Short to Ground
B1025 Seat Cordoba Injector Circuit Open / Shorted - Cylinder #4