A prevalent reason that your Q5’s engine will knock is bad spark plugs. Spark plugs are vital to proper engine combustion. There must be a solid spark to achieve clean combustion. When the spark plugs aren’t burning right, your vehicle will spark knock. Over time, spark plugs can fail for a few different reasons:
To properly diagnose the failure of your Q5, it is important to have a suitable scanner that is compatible with the brand and model of your car. The scanner will show the engine fault code that the computer has detected, which is related to a certain problem that is affecting the engine.
Q5/SQ5 MKI (8R) Discussion - New 2016 Q5 Check Engine Light - I bought a brand new 2016 Q5. 2.0T. I love the car however the check engine light came on last week. I brought it to Audi who told me it's a known issue and has to do with a fault gas cap sensor but all they can do is reset it.
9. A Vacuum Leak Is Present In The Intake System: Act quickly if you notice that your Audi EPC light is on and the car is shaking, which can be a strong sign of a vacuum leak in the intake system. Vacuum leaks affect the engine’sengine’s performance, as they occur when air enters the intake system where it should not.
Check Engine Light - Code P0420. Recently my check engine light came on for a couple of days and then off. I scaned it, and it showed code P0420 - Efficiency Below Threshold for Catalyst Sytem Bank 1. The strange thing is that it came on for a couple of days and then goes away by itself. The scan does show "MIL ON - Intermittent - Confirmed".
The average price of a 2023 Audi Q5 check engine light can vary depending on location. Get a free detailed estimate for a check engine light in your area from KBB.com. Car Values.
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    • check engine light on audi q5