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Just change manifold on an 2002 Hyundai santa fe. One of the o2 sensor is not hook up. The car start ed drive around corner car act like it was choking and stop. Now car wont start up

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    Connect the O2 sensor... – GdD Jul 12 at 13:45
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    You just did a load of work on this car, it's much more likely that there is something else wrong than an O2 sensor causing that issue. Scan your OBD codes and see what you get. – GdD Jul 12 at 19:15
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A disconnected O2 sensor would never prevent a car from starting. The computer would see the lack of o2 response and stay in OPEN LOOP mode.

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