P2642 Diagnostic Trouble Code

P2642 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 P2642 diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
Hesitation upon acceleration

Possible Causes :

Some aftermarket accessories and performance modifications
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Faulty IMRC actuator relay (if equipped)

Repair Processes :

Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio. 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. 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.

Process Tips

Diagnostic trouble code P2642 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 P2642.

Fortunately, P2642 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P2642 Trouble Code For Specific Cars

P2642 Buick 70 Cylinder 4 Injector Circuit Low
P2642 Audi Concept Anti-Theft Number of Programmed Keys Is Below Minimum
P2642 Mercedes-benz 400 Air Bag Passenger Pressure Switch Circuit Short To Ground
P2642 Jaguar X-400 Seat Driver Front Down Switch Circuit Short To Ground
P2642 Ligier Js2 Throttle Position (Narrow Range) Sensor Circuit Malfunction
P2642 Toyota Soarer Park/Neutral Switch Circuit Short To Ground
P2642 Peugeot 407 EIC Switch-1 Assembly Circuit Open