In some specific cases, particularly with the 1.5 dCi engines, a failing fuel injector can cause misfires or irregular combustion. If the engine is misfiring slightly, the torque output drops momentarily, confusing the ECU and triggering the "Invalid Torque Signal."
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).
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. mot 1654 renault
Equivalent OBD-II codes (generic): P0234 (Turbocharger Overboost Condition) or sometimes P0299 (Underboost — though that’s less common for 1654).
Code 1654 rarely appears silently. Before your MOT, you might have noticed: In some specific cases, particularly with the 1
First, let’s clarify a critical point of confusion. The string "MOT 1654" is actually a combination of two separate concepts:
When written together as MOT 1654 Renault, it typically refers to a scenario where a diagnostic scanner (often a Renault CAN Clip or a high-end OBD2 reader) reports DTC 1654 within the engine or injection system, and this code has implications for the vehicle’s MOT pass/fail status. When written together as MOT 1654 Renault ,
If you are tempted to solve 1654 by asking a tuner to “map out” the EGR or DTC, be warned: The new UK MOT rules (DVSA) now include a visual inspection for missing EGR hardware. If your car left the factory with an EGR valve, but it’s now coded out and removed, that is a Major fail.