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This month’s case study is on a 1999 Chevy Suburban with a 5.7L engine and just over 100K miles on the odometer. The customer complains that the Check Engine light is on and he has a misfire that is more noticeable at idle. A quick test drive confirmed the MIL was on and the truck had a definite misfire. Next, a scan with the Tech2 showed the following codes: P0300: Random Misfire P0135: O2 Sensor Heater Performance, Bank 1 Sensor 1 P0161: O2 Sensor Heater Performance, Bank 2 Sensor 2 Just by looking at the code descriptions, I could quickly determine that I had more than one problem. It was clear to me that the O2 Heater performance codes were not causing the truck to misfire
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