Your Renault Trafic engine control system detects a problem, the computer stores the diagnostic trouble
code U3977 in its memory.
To figure out what is wrong with your vehicle you must first extract the U3977 DTC For Renault Trafic.
U3977 Renault Trafic engine diagnostic code is about in terms of how often you should get your tyres rotated, it's different for every vehicle and type of tyre, but having them rotated at every oil change is a good rule of thumb. Check with the tyre manufacturer for a more specific time frame. Remember that the more often you rotate your tyres, the more evenly they'll wear, and when you have the tyres rotated, you should also get them checked for balance and alignment.
U3977 Renault Trafic DTC Meaning
Network Code - Problem is climate control system, lighting, airbags, etc.
SAE - Generic
Exhaust Gas Recirculation System Valve 1
Cruise Control System - Vehicle Accel Too High
If your vehicle failed a U3977 Renault Trafic test and the U3977 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 U3977 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 U3977 DTC For Renault Trafic: Any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression.