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my 98 has a po138 service code o2 sensor before converter where is this sensor and was the code correct i was told the 98 xj has 3 sensors is this correct thank you
If you see 3 then your XJ very likely has CA emissions...meaning four O2 sensors. I thought I counted 3 until I found the fourth. The upstream pair are under the exhaust manifold and the 2 downstream sensors just after the minicats (those 2 bulges at the beginning of the exhaust pipes.
Otherwise if you have "Federal emissions" there are only 2.