B0973 Diagnostic Trouble Code

B0973 is a kind of OBD-II Diagnostic B-Body 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 B0973 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Diminished fuel efficiency

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

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. 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.

Process Tips

Diagnostic trouble code B0973 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 B0973.

Fortunately, B0973 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0973 Trouble Code For Specific Cars

B0973 Abarth Stola A/C Refrigerant pressure Sensor Circuit High Input
B0973 Lotus Elise S2 111s Traction Control Disable Switch Circuit Short to Battery
B0973 Hillman Imp PATS Is Disabled (Check Link Between PATS And Transponder)
B0973 Daimler Db Headlamp Aim Output Relay Circuit Short To Battery
B0973 Renault Torpedo HO2S Heater Control Circuit High (Bank 1 Sensor 1)
B0973 Skoda Roomster Lack Of HO2S Switch - Sensor Indicates Lean
B0973 Marcos 850 Transfer Case Contact Plate "D" Encoder Circuit Failure