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Re: 2004 Grand Cherokee - Replacement O2 sensor and catalytic convertor
O2 sensor you can do yourself, it (or they, if you have one before and one after the cat) simply screw into the exhaust and have a snap connector to the wiring harness.
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Ours: 2020 Jeep Wrangler 2.0, 53k
2013 Toyota FJ Cruiser, 84k
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