The O2 sensors on a 1999 Jeep Grand Cherokee 4.7 V8 are located in two primary positions: one before the catalytic converter (upstream) and one after it (downstream). The upstream O2 sensor is typically found on the exhaust manifold or just after it, while the downstream sensor is located after the catalytic converter in the exhaust system. Both sensors are crucial for monitoring the air-fuel mixture and emissions.
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