Renault ECUs (especially on early 1.2 TCE engines) sometimes suffer from failed injector driver transistors. If the wiring and injector test fine, the ECU itself may be the culprit.

. Essential for owners and mechanics working on modern Renault engines, this "cloche" or cup-style wrench ensures a secure grip on the filter housing, preventing damage during routine maintenance. Why the MOT 1654 is a "Must-Have"

Seat the Mot. 1654 wrench firmly over the top of the oil filter. Push it all the way down until the 14 flutes fully mesh with the housing grooves.

Allows for easy entry into cramped engine bays. Why Mot.1654 is the Best Choice for Renault Service

In simpler terms, the engine control unit (ECU) has detected an abnormality in the electrical circuit that controls fuel injector number 4. This “low” or “open” signal means the ECU is seeing either:

Insert a standard 3/8" extension or ratchet handle into the center square hole, or place a 27 mm socket/spanner over the external hex.