P0104 Diagnostic Trouble Code

P0104 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 P0104 diagnostic trouble code may include:

Fuel pressure too high
Diminished fuel efficiency
Rich or lean exhaust
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
Faulty IMRC actuator relay (if equipped)

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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code P0104 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 P0104.

Fortunately, P0104 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0104 Trouble Code For Specific Cars

P0104 Suzuki F1 Metering Oil Pump Position Sensor Circuit Malfunction
P0104 Porsche 928 Fuel Delivery System Malfunction - Low
P0104 De Soto Firedome Hood Switch Circuit Short To Battery
P0104 Zaz Wagon SCP (J1850) Invalid or Missing Data for Window Wiper / Washer
P0104 Peugeot Nautilus Engine Coolant Sensor intermittent/ECT Sensor Intermittent
P0104 Honda Edix Pressure Transducer Main / Primary signal Faulted
P0104 Honda Z Reverse Switch Circuit Malfunction