P194D Diagnostic Trouble Code

P194D 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 P194D diagnostic trouble code may include:

Hesitation upon acceleration
Excessive exhaust leak
Rich or lean exhaust
Lack of power

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Some aftermarket accessories and performance modifications

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. 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. 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 P194D 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 P194D.

Fortunately, P194D is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P194D Trouble Code For Specific Cars

P194D Packard 400 DPFE Sensor Hoses Reversed
P194D Innocenti Turbo
P194D Woodill Wildfire
P194D Renault Nervasport Heated Catalyst Efficiency Below Threshold (Bank 2)
P194D Ds Ds 3 Ignition Tamper Circuit Short To Ground
P194D Vauxhall Zafira Pressure Transducer Redundant / Secondary Input Circuit Failure
P194D Morgan 4 Booster Pedal Force switch circuit Failure