C1148 Diagnostic Trouble Code

C1148 is a kind of OBD-II Diagnostic C-Chassis 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 C1148 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
Diminished fuel efficiency

Possible Causes :

The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Defective ECU strategies or components will prevent proper regeneration
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

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. If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve.

Process Tips

Diagnostic trouble code C1148 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 C1148.

Fortunately, C1148 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1148 Trouble Code For Specific Cars

C1148 Dodge Ram Ignition Run/Acc Circuit Short To Battery
C1148 Mercedes Slk 230 Air Bag Diagnostic Monitor Ground Circuit Open
C1148 De Tomaso Pampero Hydraulic Clutch Actuator Valve Signal Fault
C1148 Volkswagen Bora Recirculation Override Circuit Malfunction
C1148 Austin Princess Aux A/C Blower Speed 2 Circuit Failure
C1148 Holden Caprice Pedal Position Rearward Switch Circuit Short to Battery
C1148 Citroen C4 Ii Fuel Composition Sensor Circuit High Input