P1973 Diagnostic Trouble Code

P1973 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 P1973 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly

Possible Causes :

A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Faulty IMRC actuator/sensor
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code P1973 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 P1973.

Fortunately, P1973 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1973 Trouble Code For Specific Cars

P1973 Suzuki Light Mirror Driver Horizontal Feedback Potentiometer Circuit Open
P1973 Bmw-isetta 600 Communication Bus Error (Non SCP)
P1973 Saturn Outlook Immobilizer/ECM Communication Error
P1973 Subaru Forester 3 Left Lamp Outage Signal Circuit Short to Ground
P1973 Vale 1100 Power Window LR Motor Circuit Short To Ground
P1973 Renault Clio 3 Gear Shift Module Communication Circuit High
P1973 Acura El ABS Hydraulic Pressure Differential Switch Input Short Circuit To Ground