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If on a dCi engine, check the exhaust pressure sensor for high voltage readings, particularly with the ignition on.
DTC (Diagnostic Trouble Code) P158B is generally interpreted as an . In some Renault contexts, particularly in diesel engines like the 1.5 dCi, it can be linked to exhaust pressure sensor voltage issues.
Inspect the wiring harness and connectors associated with the idle control actuator. Look for broken, bent, or corroded pins.
