P1641 Diagnostic Trouble Code

P1641 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 P1641 diagnostic trouble code may include:

Cherry red hot catalytic converter
Poor acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Reduction in engine performance, especially at low RPM levels

Possible Causes :

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.
Some aftermarket accessories and performance modifications
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

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. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors.

Process Tips

Diagnostic trouble code P1641 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 P1641.

Fortunately, P1641 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1641 Trouble Code For Specific Cars

P1641 Nissan Skyline Cruise Control On Signal Malfunction
P1641 Stanley 20 Lamp Keypad Output Short Circuit To Ground
P1641 Mercedes-benz W110 Air Suspension LF Air Spring Solenoid Output Circuit Failure
P1641 Samsung Sm3 Illuminated Entry Input Short Circuit To Ground
P1641 Austin 10 Audio Remote Climate Control Unit is Not Responding
P1641 Mercedes-benz 190 Air Bag Memory Clear Circuit Open
P1641 Mercedes-benz Vito Air Suspension Height Sensor Power Circuit Short To Ground