C1842 Diagnostic Trouble Code

C1842 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 C1842 diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
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
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. 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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

Process Tips

Diagnostic trouble code C1842 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 C1842.

Fortunately, C1842 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1842 Trouble Code For Specific Cars

C1842 Alfa Romeo Arna Accessory Delay Relay Coil Circuit Failure
C1842 Ford C-max Loss of KAM Power; Open Circuit
C1842 Ginetta G32 Optical Sensor System Failure
C1842 Citroen C3 Picasso Front Wiper Select Switch "H" Short to Ground
C1842 Lamborghini Marzal Solar Radiation Sensor Circuit Failure
C1842 Volkswagen Polo 5 Rotor Sensor Fault
C1842 Daewoo Rexton Gear 3 Incorrect ratio