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won't crank

  1. Problems & Troubleshooting
    I have a 2005 Ion Redline. 145,000 miles on it. So I know all about the ignition switch and we replaced and did the relearn to the car. That was about 2 years ago. Just recently, car was running fine, but the engine light has been on due to the o2 sensor. Replaced it 3 times and still it...
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