Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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This vehicle has 2 oxygen sensors.
The upstream (sensor1) is mounted to the exhaust manifold, at the rear of the engine compartment, closest to the firewall.
The downstream (sensor2) is mounted to the exhaust, under the vehicle, behind the converter.
is sensor 1 the upstream sensor?
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need help on a 1999 Chevy K3500 pickup with a 7.4 L