ReiBehrens

Fiorino NOx Sensor Connector Corrosion

My 2003 Fiat Fiorino with a gasoline engine is acting up. The check engine light is on, and the computer says something about NOx. Plus, I smell exhaust fumes near the front. I think it's a bad NOx sensor since I saw the error code, and the garage said a defective connection could be the cause. Has anyone seen this before? I'm trying not to replace the catalytic converter.

A 2003 Fiat Fiorino was experiencing issues with the check engine light and exhaust fumes, suspected to be related to a NOx sensor problem. The likely cause was identified as corrosion in the sensor's connector, a common issue due to exposure to road salt and water. The suggested solution was to inspect and clean the connectors, which ultimately resolved the problem after a workshop confirmed and repaired the corroded connection.

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4 comment(s)

Sounds rough! I had a similar issue with my Fiorino – exhaust leak, engine light, the works. NOx sensor problems can be a pain. Before you buy a new sensor, have you checked the wiring and connectors? They're exposed and corrode easily. It's like a bad light switch – sometimes it's the switch, sometimes it's a loose wire.

Good call about the connectors! I wiggled them, but didn't look closely. Where should I be looking? Is there a common spot where the wires break or the plug gets gunked up?

Dig deeper. On mine, the connector where it plugs into the sensor was the problem. Salt and water spray from the road caused corrosion. I tried cleaning it, but it was too far gone. If you're not comfortable doing it yourself, take it to a workshop, but I think that might be it.

You were right! The workshop confirmed it was a corroded connector. They cleaned it, replaced some wire, and cleared the code. Total cost was 95€. Thanks for the advice; you saved me money and stress!

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FIAT

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FIORINO