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On the 2.4 L the up stream O2 sensor is located in the exhaust manifold between the engine and the firewall. It has a single wire coming out of it. I believe it will be a purple wire. The down stream, heated O2 sesor is located under the car after the catalytic converter in the ehaust piping. It will have four wires coming from it.

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โˆ™ 2011-09-14 10:52:39
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Q: Where are the oxygen sensors on the 98 Pontiac Sunfire?
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