P1309 Diagnostic Trouble Code

P1309 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 P1309 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.
Engine surge

Possible Causes :

Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
An air leak forward of the DPF will change the sensor readings resulting in the code
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code P1309 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 P1309.

Fortunately, P1309 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1309 Trouble Code For Specific Cars

P1309 Toyota Prius 4 Park Brake Actuator Assembly Switch Released Circuit Failure
P1309 Maserati Simun Transmission Mechanical 4-Wheel Drive Axle Lock Lamp Circuit Failure
P1309 Lagonda Vignale Shift Solenoid E Malfunction
P1309 Opel Caravan Decklid Ajar Rear Door Circuit Short To Ground
P1309 Suzuki Sx4 I Mirror Driver Switch Assembly Circuit Short To Battery
P1309 Chevrolet Venture Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage/IAT - B Circuit Low Input
P1309 Amphicar 770 Air Suspension LF Corner Up Timeout