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OBW H6 VDC, Tribeca, XT6
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rear O2 sensor is not used by the ECU for running the engine so it won't affect drivabiliy, emissions only.

sounds like a vacuum leak somewhere. spray starting fluid all over the ihtake and vacuum hoses around the engine while trying to start it.

has the timing belt ever been changed? it is nearly 10 years past due if it hasn't been replaced yet. (at best it's every 105,000 miles or 8 years) if it's a manual transmission then it has the Ej22 and has an ever shorter timing belt interval).
may be a slipped or compromised timing belt/pulley.
 
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