Hey Scotty, thanks for all you do for the car community! Here’s my question…I have a 2017 Audi Q2 with the 2.0T 4-cycle engine. I’m getting a “check engine” warning light and when I scan the OBD I’m getting code P0420. I changed the Bank 1 O2 sensor and erased the code. The same fault keeps coming back after about 50 miles of driving. What could be causing this? A faulty sensor or something else I should be aware of. Thanks for you help!
~Scott
What could be causing this?
Did the O2 sensor test as being bad? Have you looked into the possible causes and diagnosis of that code? There are quite a few potential issues, including but not limited to the converter itself.
https://www.walkerexhaust.com/support/tech-tips/diagnosing-catalytic-converter-p0420-code.html
https://www.obd-codes.com/p0420
See the P0420 topic in our FAQ
