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I just bought my girlfriend a 2006 ls with an auto. I just changed the plugs, oil, and charged the AC. I took the air filter out to check it and it was clean so I put it back in. Well after driving for 20 minutes the check engine light came on. I took it to autozone and thier reader says it is a p0340 code which is for a cam sensor. I did change the oil to 5w-20 but don`t think that caused it. I cleaned the MAF sensor and it went away for a day but is back on now. Any ideas
 
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