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This indicates that you have a malfunctioning oxygen sensor. Take your Jeep to one of the name brand auto parts store and they will have a reader that will verify this and sell you a new sensor. That will most likely take care of the problem.

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14y ago
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16y ago

bad connection to O2 sensor, or dirty/bad O2 sensor.... clean or replace with new

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6y ago

Code 31, evaporative purge solenoid incorrect flow.There is likely a broken hose between the fuel tank and the engine.

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15y ago

EGR Valve Sensor....

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13y ago

it means end of diagnostic check

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Q: What is diagnostic code 21 in a 1997 Jeep Grand Cherokee?
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