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WolfiSchulzi

Mini Roadster Oxygen Sensor Heater Failure

I'm experiencing an oxygen sensor heater failure in my 2014 Mini Roadster. The check engine light is on, and the error memory indicates a problem with the oxygen sensor heater circuit. I've also noticed a slight increase in fuel consumption. From what I've read, a defective cable or plug connection could be the culprit. Has anyone else dealt with this issue, and is it likely the cause of the malfunction indicator and potential skewing of the air-fuel ratio and vehicle emissions?

Summary of the thread

A 2014 Mini Roadster experienced an oxygen sensor heater failure, indicated by a check engine light and increased fuel consumption. The issue was suspected to be a defective cable or plug connection affecting the sensor's heater circuit, potentially skewing the air-fuel ratio and emissions. After a shop visit, it was confirmed that a faulty connection was the cause, which was cleaned and secured, resolving the problem and turning off the check engine light.

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4 comment(s)

christopherbecker1

Oxygen sensor issues on these cars can be tricky. I had a similar problem with my Mini. Check engine light, rough idle sometimes, the works. Before you start replacing sensors, have you checked the wiring and connectors to the oxygen sensors? Sometimes, it's just a loose or corroded connection that's throwing the code. Think of it like a loose wire on a light bulb – the bulb itself might be fine, but it won't light up if the connection is bad. Which oxygen sensor is throwing the code, by the way? Pre-cat or post-cat?

WolfiSchulzi (community.author)

Thanks for the insight. I did a visual inspection of the wiring, but didn't see anything obvious. The error code points to the pre-cat oxygen sensor, specifically the heater circuit. Is there a good way to test the wiring harness or connector to confirm?

christopherbecker1

Ah, the pre-cat sensor. That makes sense with the fuel consumption. If the heater isn't working, the sensor takes longer to reach operating temperature, and the engine management might run in open-loop longer, using a richer mixture. Honestly, without proper sensor testing tools, chasing wiring gremlins can be a real pain. If you aren't comfortable probing the connector, I'd suggest taking it to a trusted shop. 95€ sounds like a fair price to diagnose and repair a connection issue. Better than throwing parts at it and hoping for the best.

WolfiSchulzi (community.author)

Just got the Mini back from the shop. As suspected, it was a faulty connection on the oxygen sensor. They cleaned it up and secured it properly. Check engine light is off, and hopefully, the fuel consumption will return to normal. Thanks for the tip!

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MINI

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ROADSTER