Volkswagen poloepc light is on, and the throttle is off!

There is something wrong with the sensor of your three-way catalytic converter. It is recommended to disassemble and clean the waste gas. Do not use infusion bottles. The infusion bottle was not thoroughly cleaned. I'll make a list for you: 1. Remove the sensor and clean it with alcohol and ultrasonic wave. 2. Seal with radish or potato, soak the honeycomb structure with oxalic acid for half an hour, rinse with tap water, and then blow dry with high-pressure air. 3. load the car.