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− − − − − S0X4A00K77100090420FAAT00 DTC P0420: YES NO 11-246 Catalytic Converter System DTC Troubleshooting Catalytic System Efficiency Below Threshold NOTE: • If some of the DTCs listed below are stored at the same time as DTC P0420, troubleshoot those DTCs • Information marked with an asterisk ( ) applies to ’02-04 models. P0137, P0138: Secondary HO2S (Sensor 2) 1. Reset the PCM (see page 11-4), then do steps 2 through 5 to reset the readiness code. 2. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan 3. Drive for about 10 minutes, without stopping, on a highway or freeway. Your speed can vary. 4. With the transmission in D4 (D5) position, drive at a steady speed between 50 62 mph (80 100 km/ h) for 30 seconds. 5. Repeat step 4 three times. Between each repetition, close the throttle completely for 1 2 seconds. If the engine is stopped during this part of the 6. Check for a temporary DTC with the scan tool or the HDS. Check the TWC. If necessary, replace the TWC. Check for readiness code completion. If the readiness code is complete, it was an intermittent Does the scan tool indicate T empor ar y DT C 03/07/29 09:24:46 61S0X050_110_0246 |