The solid V6 of the Grand Cherokee and Wrangler. Generally durable, but at high mileage the catalysts and knock sensors start to show their age.
Click a code for the full breakdown: symptoms, causes, and whether you can keep driving.
Random/Multiple Cylinder Misfire Detected
The engine control unit detects misfires occurring randomly across multiple cylinders, meaning combustion is failing intermittently in more than one cylinder.
System Too Lean (Bank 1)
The engine is getting too much air or too little fuel on bank 1 - the ECU has hit the limit of its ability to compensate.
Catalyst Efficiency Below Threshold (Bank 2)
Same fault as P0420 but on the second cylinder bank of V6/V8 engines - the catalytic converter on bank 2 is underperforming.
Catalyst System Efficiency Below Threshold (Bank 1)
The downstream oxygen sensor shows the catalytic converter on bank 1 is no longer cleaning exhaust gases efficiently.
Knock Sensor Circuit Malfunction
The knock sensor signal is invalid - the ECU can no longer detect detonation and retards timing defensively.
Camshaft Position Sensor Circuit Range/Performance
The camshaft position sensor signal is present but implausible or erratic.
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