U0085 Briscoe Cloverleaf Diagnostic Trouble Code
U0085 Briscoe Cloverleaf code definition:
U0085 is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code for Briscoe Cloverleaf.
U0085 Briscoe Cloverleaf is described as Oxygen Sensor Circuit No Activity Detected (Bank 1, Sensor 1). This means there's a problem in the front oxygen sensor on Bank 1, as the O2 sensor is inactive. The PCM then uses this data to provide the right strategies for the fuel delivery and ignition timing of the engine.
Symptoms
Symptoms of a U0085 Briscoe Cloverleaf diagnostic trouble code may include:
- Malfunction Indicator Lamp (MIL) illuminated
- Carbon Buildup on O2 Sensor
- Poor fuel economy
- Reduction in engine performance, especially at low RPM levels
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Possible Causes :
- Dirty air cleaner element Damaged DPF
- A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
- Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
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Common Misdiagnoses
- Crankshaft Position Sensor Circuit Performance Problem
- TP Sensor Learn Not Complete Problem
- Low Coolant Circuit Problem
- Cruise Control System - Vehicle Accel Too High Problem
- Kick-Down Switch Failed Short Problem
Repair Processes :
If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for.
Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.
Process Tips
Diagnostic trouble code U0085 Briscoe Cloverleaf 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 U0085 Briscoe Cloverleaf.
Fortunately, U0085 Briscoe Cloverleaf is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.
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