This article breaks down what code 1654 means, which Renault engines it affects, the common symptoms, diagnostic steps, and permanent fixes. After cross-referencing Renault’s technical bulletins and owner forums, MOT 1654 typically refers to a Turbocharger Pressure Regulation Fault — more precisely, a deviation between the requested boost pressure and the actual measured boost pressure (often a positive deviation or overboost).
Date: October 2023 Reading time: 6 minutes mot 1654 renault
A second mechanic found a cracked vacuum hose near the brake servo. The tiny leak (3mm split) was causing the turbo actuator to see only 0.3 bar instead of 0.8 bar. The ECU, seeing sluggish vane movement, logged overboost when the system finally caught up. This article breaks down what code 1654 means,
In plain English: The engine’s ECU (Engine Control Unit) commands a certain amount of boost from the turbocharger, but the sensors report that the system is producing too much pressure for too long. The tiny leak (3mm split) was causing the