Q7 Oil Pressure Warning Nightmare: Sensor Gone Bad

I had a similar issue with my 2016 Audi Q5 with the oil monitoring system showing incorrect readings. Based on some experience working on modern cars, I can share what worked in my case. The faulty sensor readings turned out to be caused by a loose cable connection at the oil pressure sensor. The car maintenance technician found that the wiring harness connector wasnt properly seated, causing intermittent signal issues. The repair involved cleaning the connection points and properly securing the plug, which resolved the oil sensor warnings. The total repair cost was 95 Euro including diagnostic time. Its worth noting that failing to address oil pressure warnings can lead to serious engine damage, even if its just a sensor issue. For proper diagnosis of your Q7, could you share: Current mileage, When was your last oil change, Are there any other warning lights active, Does the warning appear more frequently at specific times (cold start, highway speeds, etc) This information would help determine if youre dealing with a similar connection issue or if theres something else going on with your oil monitoring system.

My current mileage is 23924 KM and my last service was just done 2 months ago. The engine oil was changed then and the warning started appearing shortly after, mainly during cold starts. The oil detection system shows no other active warnings besides the oil pressure alert. I noticed the warning tends to clear itself after the engine warms up, which makes me think your suggestion about checking the sensor connections could be relevant. The car maintenance history has been perfect until now with no previous sensor issues.

Thanks for providing those details. Given your recent oil change timing and the warning pattern during cold starts that clears up after warming, this really sounds similar to what I experienced with my Q5. After hearing about your cold start symptoms, I'm even more convinced it could be the wiring connection issue. In my case, the temperature changes between cold and warm engine were causing the connector to expand/contract just enough to create intermittent oil sensor readings. A few quick checks you can try: Review if the warning behavior changed immediately after the recent service, Listen for any unusual engine noises during cold starts, Note exact temperature conditions when the warning appears The faulty sensor behavior being tied to engine temperature is a classic sign of connection issues in the oil monitoring system. Since your maintenance history is clean and oil was recently changed, physical wiring problems are more likely than actual sensor failure. Would recommend having a technician inspect the oil pressure sensor connections before replacing any parts. The diagnostic process in my case started with checking these connection points, saving considerable cost over full sensor replacement.

The timing of these oil pressure warnings starting right after my service visit seems more than coincidental now. Really appreciate the detailed explanation about the connection between temperature changes and oil sensor behavior, it matches exactly what I'm experiencing with my Q7. Going to have the oil monitoring system connections checked first before jumping to sensor replacement. The fact that the oil signal clears up once the engine warms makes me optimistic its just a loose connection from the recent service work. Will make sure to have them inspect all the wiring around the engine oil sensor area carefully. Good to know this was fixable without major repairs in your case. I've scheduled a workshop visit for next week to have them look specifically at the sensor connections. Will definitely keep an eye on whether the oil gauge warnings get worse or change pattern before then, but feeling more confident now about the likely cause. Thanks for walking through your similar experience, really helped narrow down where to start with the diagnostics.