does the 2002 grand cherokee, 4.0 litre, federal mission only have one oxygen sensor before the converter?
Re: 02 question
According the jeep manual the 4.0 with federal emissions package has one sensor before and 1 sensor after the cat. That is strange, because the fault code you had was stating 2/1, which would led believe you should have 4 O2 sensors and the California Emissions package.
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