To do this, locate the sensor, which is typically mounted on the exhaust manifold or the exhaust pipe, depending on your Q5’s model year and engine type. Before starting the inspection, ensure your Q5 has cooled down to prevent burns. Look for signs of damage, such as: Corrosion or rust on the sensor or its wiring.
Check engine light came on and local mechanic got code P00B700 and recommended replacing water pumpand thermostat. It turns out that is under warranty to 80000 miles. Fortunately my milage is 79600.
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