Question about 1994 Jeep Cherokee
Error code 21 is oxygen sensor or circuit.Check the oxygen sensor first and then the circuit. The sensor is on the exhaust manifold or on the exhaust downpipe.Its purpose is to measure air/fuel ratios and adjust the fuel that the injectors deliver.Above 80000 miles is the sched. to replace this sensor. Hope this helps
Posted on Aug 16, 2009
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Posted on Jan 02, 2017
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