Renault !!hot!!: P158b

P158B is a manufacturer-specific OBD-II diagnostic trouble code (DTC) used by Renault. It indicates a fault related to the throttle actuator/pedal or its control logic—essentially a mismatch or error in the drive-by-wire (electronic throttle) control system. Because Renault uses proprietary naming and control strategies, P158B is not part of the generic SAE list and its precise trigger conditions vary by model and model year.

, or as a sensor for mechanical positions where a reliable electrical signal is needed based on manual rotation. Key Technical Specifications p158b renault

By 1978, the Renault 4 was already 17 years old. Competitors like the Peugeot 104, Fiat 127, and even Renault’s own newer models (Renault 5) offered more modern features. The P158B update was Renault’s attempt to: , or as a sensor for mechanical positions