P1642 Diagnostic Trouble Code

P1642 is a kind of OBD-II Diagnostic P-Powertrain 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 P1642 diagnostic trouble code may include:

Poor fuel economy
Possible spark knock (detonation / pre-ignition)
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
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 :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. 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 P1642 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 P1642.

Fortunately, P1642 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1642 Trouble Code For Specific Cars

P1642 Lagonda 42 Hp Shift Solenoid D Performance or Stuck Off
P1642 Porsche 804 Front Washer Input Short to Ground
P1642 Mazda 323 Transmission Transfer Case Contact Plate 'C' Circuit Failure
P1642 Ferrari Tipo Keyless Entry Circuit Short To Ground
P1642 Proton Perdana Fuel Shutoff Valve Control Circuit Low
P1642 Dacia Sandero Fuel Temperature Sensor B Circuit High Input
P1642 Honda Acura Integra Pressure Control Solenoid B Control Circuit Range/Performance