B1042 Diagnostic Trouble Code

B1042 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 B1042 diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Faulty IMRC actuator/sensor

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. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.

Process Tips

Diagnostic trouble code B1042 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 B1042.

Fortunately, B1042 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1042 Trouble Code For Specific Cars

B1042 Facel Vega Facellia Injector Circuit / IDM Codes Not Updated
B1042 Holden Jackaroo Power Sliding Door Opened During Module Close Command
B1042 Kia K2700 Seat Switch Reference Voltage Positive Common Supply Voltage Fault
B1042 Volvo Xc70 Ii SCP (J1850) Invalid or Missing Data for Function Read Engine Torque
B1042 Toyota Isis Oil Level Switch Circuit Short To Battery
B1042 Renault Initiale Glow Plug Monitor Fault (Bank #1)
B1042 Porsche 804 Front Washer Input Short to Ground