2000 Pontiac bonneville SSEI with 185000 miles. About 3 weeks ago I started getting an intermittent service engine lgt. Scanned at auto parts store. I was told I might need to clean the egr valve. The egr valve was replaced a week ago and after about 15 miles of driving the light came back on again and stayed on. Before the egr valve was replaced I had noticed a drop in my gas mileage a couple of weeks before the service engine lgt had started coming on. After the egr valve was replaced, I got another scan done, now I have 2 codes (p0401, p1133) low egr flow and bank 1 o2 error. Gas mileage is still bad. One year since spark plugs and fuel filter replaced. What do I check next? What could be the problem?
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Tuesday, March 15th, 2011 AT 7:56 PM