B1242 Diagnostic Trouble Code

B1242 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 B1242 diagnostic trouble code may include:

Blown fuse (if applicable)
Engine surge
Reduction in engine performance, especially at low RPM levels
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.
Dirty air cleaner element Damaged DPF

Repair Processes :

If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. 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 B1242 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 B1242.

Fortunately, B1242 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1242 Trouble Code For Specific Cars

B1242 Ferrari 801 Intake Valve Control Solenoid Circuit Range/Performance (Bank 2)
B1242 Peugeot 208 EGI Functionality Test Failed
B1242 Oldsmobile Achieva Cylinder 6 Contribution/Balance Fault
B1242 Moretti 128 Battery Temp out of Range
B1242 Zender Vision SCP (J1850) Lack of Acknowledgment for Mirrors
B1242 Nissan Axy Climate Control Air Temperature Internal Sensor Motor Circuit Short To Ground
B1242 Chery J1 DPFE Circuit High Input