2006 hhr 2.2 engine. Check engine light comes on when I turn air conditioning on. Car idles ruff when air is on. Gives code P 0420. I reset code and drove for two weeks without air on. Car ran great and no codes. I turned air on and P0420 code came on again and car idles ruff. Any ideas. Thx

Asked by Jul 01, 2017 at 04:21 PM about the 2006 Chevrolet HHR LT

Question type: Maintenance & Repair

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