P16C4 Diagnostic Trouble Code

P16C4 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 P16C4 diagnostic trouble code may include:

Malfunction Indicator Lamp (MIL) illuminated
Carbon Buildup on O2 Sensor
Poor fuel economy
Diminished fuel efficiency

Possible Causes :

Faulty IMRC actuator/sensor
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. 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. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code P16C4 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 P16C4.

Fortunately, P16C4 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P16C4 Trouble Code For Specific Cars

P16C4 Peugeot Escapade Emergency Power Off System Faulted
P16C4 Mazda Mx-5
P16C4 Ferrari F310 Intermediate Shaft Speed Sensor Circuit No signal
P16C4 Nissan Stanza Cruise Control/Brake Switch A Circuit Low
P16C4 Honda Prelude Rear Echo Sensor Circuit Failure
P16C4 Ssangyong Rodius Lamp Headlamp High-Beam Circuit Short To Ground
P16C4 Salmson S.4.61 Illuminated Entry Input Short Circuit To Battery