Q: I have just replaced radiator fan on 2006 chevy hhr LT 2.2 got codes P0171 & P0420

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I previously had a P0420 code. I took it to get the catalytic converter checked. I was told to do a complete tune up. After doing the tune up, the check engine light turned off. Just a few days ago I had my radiator fan replaced and now I have the check engine light on again with codes P0171 and P0420. What would be recommended for this?

My car has 116000 miles.
My car has an automatic transmission.

Hi there. I would recommend reading these two articles highlighted in blue as they will explain what the code means, what causes it and possible solutions. At the bottom of each page is a box saying Get a Quote to have one of our professional mechanics come to your location and correctly diagnose these issues. P-0171 ODB-II Trouble Code article & P0420 OBD-II Trouble code article.

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