U0391 DTC For Ford Focus
Ford Focus Engine Specifications:
| Engine Type : | Single Cylinder Engine |
| Cylinder Type : | Opposite Piston Engine |
| Engine Air Intake Process : | Naturally Aspirated |
Your Ford Focus engine control system detects a problem, the computer stores the diagnostic trouble
code U0391 in its memory.
To figure out what is wrong with your vehicle you must first extract the U0391 DTC For Ford Focus.
A good ground connection is also extremely important. U0391 Ford Focus engine problem because the presence of voltage at the panel harness won't make the panel work if there is a bad ground connection. Since the instrument cluster is mounted in a plastic dash, a separate ground wire or ground circuit through the wiring harness is usually needed to complete the power circuit. Refer again to the wiring diagram to find the ground path, and then check it with your ohmmeter. Do not use a self-powered test light because it cannot measure resistance (any resistance will lower circuit voltage).
U0391 Ford Focus DTC Meaning
| U |
Network Code - Problem is climate control system, lighting, airbags, etc. |
| 0 |
SAE - Generic |
| 3 |
IC Module 4X Ref Circuit Intermittent, No Pulses |
| 9 |
TP Sensor Learn Not Complete |
| 1 |
PCM Stack Overrun |
If your vehicle failed a U0391 Ford Focus test and the U0391 Check Engine Light is NOT on, chances are you have a problem with the OBDII system, a burned out MIL lamp, or a faulty catalytic converter. The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses U0391 a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing (ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter). What you want to look U0391 DTC For Ford Focus: Any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression.
You can also check other Ford car models :
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The listed Ford models will give information about U0391 DTC.
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