The engine may idle too high, too low, or surge/struggle at a standstill.
Understanding and Fixing Renault Fault Code P158B If your Renault’s dashboard has lit up with a Check Engine light, and a diagnostic scanner reveals the code , you are likely dealing with a manufacturer-specific powertrain issue. While OBD-II scanners sometimes provide generic definitions, this code often relates to internal diagnostics within the idle-speed control system or exhaust pressure management, particularly in Renault and Dacia models. p158b renault
Open or shorted harness related to the actuator. Poor Electrical Connection: Corrosion on connector pins. The engine may idle too high, too low,