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How to Resolve the Yellow Warning Light Issue on a Fiat Punto Evo
Model: Fiat Punto
MK 3, Punto EVO, 199, Grandepunto
- Years 2005-2018
In this video, we see how to resolve the yellow warning light issue on a Fiat Punto Evo multipower running on methane. The engine light remains on despite the YouTuber attempting to reset the light by clearing the error via the OBD port, but upon restarting the car, the light comes back on. This corresponds to error P0191, which relates to the pressure sensor; indeed, the vehicle cannot switch from petrol to methane fuel. Therefore, you need to identify the pressure sensor, remove it, clean it, and see what happens. The sensor is located on the left side of the filter box, at the bottom, inserted within the intake manifold. First, unplug the connector, then remove the side Torx 25 screw and gently pull out the sensor. Do not touch it with your hands! (the YouTuber shows how to do this) and clean it with Fulcron and a contact cleaner spray. Wait for it to dry, clean the connector as well, and reassemble. The light has turned off and the vehicle switches to methane.
Updated on 5 August 2026 by ScegliAuto
Video tutorial
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