Your Renault 12 engine control system detects a problem, the computer stores the diagnostic trouble
code P2091 in its memory.
To figure out what is wrong with your vehicle you must first extract the P2091 DTC For Renault 12.
On 1999 and later P2091 Renault 12 engines, the instrument cluster has a built-in self-diagnostic mode that can be accessed by pressing and holding the instrument cluster SELECT/RESET button. Insert the ignition key and turn to the RUN position (but don't crank or start engine). Continue to press and hold the SELECT/RESET button (for 5 seconds) until the word TEST is displayed by the odometer. Release the SELECT/RESET button within three seconds after the word TEST is displayed to begin the self-diagnostic mode.
P2091 Renault 12 DTC Meaning
Powertrain Code - Problem is related engine, transmission and emissions systems.
MFG - Manufacturer Specific
TP Sensor Learn Not Complete
PCM Stack Overrun
If your vehicle failed a P2091 Renault 12 test and the P2091 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 P2091 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 P2091 DTC For Renault 12: Any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression.