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Have you checked the downpipe where it bolts to the mid pipe section? If that’s loose or not sealed well, it’s possible that air could be mixing in and causing a bad reading. It could also cause a bad temperature reading too.
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2006 Z4 M Roadster - Silver Grey Metallic
2011 X3 xDrive28i - Deep Sea Blue Metallic
2012 X5 M - Monte Carlo Blue Metallic
2017 X1 xDrive28i - Alpine White
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