lindaice1

Fiat Bravo knock sensor issue

I'm having a headache with my 2011 Fiat Bravo, gasoline engine. The check engine light is on, fuel consumption has gone up, and it's idling like it's got the hiccups. I'm thinking it's the knock sensor. Anyone else seen this before? I suspect it might just be a bad connection, I checked around the sensor and the plug seems ok, but not sure. Where should I start?

A 2011 Fiat Bravo with a gasoline engine is experiencing issues such as the check engine light being on, increased fuel consumption, and rough idling. The suspected cause is a faulty knock sensor or a bad connection. Upon inspection, a crack in the insulation of the cable near the sensor was found, likely due to engine heat. Replacing the sensor and fitting a new connector resolved the problem, restoring the car's performance.

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4 comment(s)

I had a similar issue with my Bravo, though I can't recall the year right now. Same symptoms: check engine light, poor fuel efficiency, and rough idling. The diagnostic pointed to the knock sensor as well. Did you check the cable leading to the sensor itself? Sometimes the insulation gets brittle and cracks, causing a short.

Good point! I only gave the plug a quick once-over. Where on the cable did you find the damage? Was it near the sensor or closer to where it connects to the main harness? Just trying to save myself some time digging around.

In my case, it was closer to the sensor. The heat from the engine had definitely taken its toll. However, since you are not sure, I recommend visiting a trusted workshop to properly diagnose the issue before replacing any components.

Thanks for the tip! I checked the cable like you said, and you were spot on, there was a crack in the insulation! A new sensor and fitting a new connector cost me 95€. Runs like a dream now!

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FIAT

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BRAVO