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Dreaded P0420 CEL


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So I had several cel's in the past month or so. P0420,P1153,P0134. Had been getting them only about once a week or so since begining of November and not all at the same time. Hit a deer the 2nd week of December and car was down for 3 weeks getting fixed. Got the car back and all 3 codes tripped after driving 40 miles or so. They then came on every day after around 30-40 miles. Changed out front O2 sensor and drove aurond 50 miles and no cel light then bam on it comes. Checked and now I have only the P0420 code. Light came on every day and only the P0420 code. So after researching the P0420 code it was change out the rear O2 sensor and pray the cat isin't bad. Well got 70 miles since sensor change and no cel yet. Keeping fingers crossed! Should also note this is on a 2.5i.
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