P291A Diagnostic Trouble Code

P291A 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 P291A 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.
Engine surge

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

Process Tips

Diagnostic trouble code P291A 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 P291A.

Fortunately, P291A is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P291A Trouble Code For Specific Cars

P291A Marcos Mantula Transmission 4-Wheel Drive High Indicator Circuit Failure
P291A Kia Retona Secondary Air Injection System Incorrect Flow Detected
P291A Horch 853 RF LAMP LOW BEAM CIRCUIT Failure
P291A Honda Crossroad Pressure Control Solenoid Malfunction
P291A Auto-union 1000 Aux Heater Fuel Pump Circuit Open
P291A Saturn Astra Illuminated Entry Relay Short To Ground
P291A Grant Grant Passenger Power Window Motor Circuit Short To Battery