check engine is ON always when gas tank reach half the light go Off,I have the code P0420
Feb 18, 2011 at 1:30 AM
check engine on and off
2002 HONDA CRV
PALERO
- MEMBER
- 3 POSTS
- FOLLOW
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DTC P0420: Catalyst System Efficiency Below Threshold
NOTE:
If some of the DTCs listed below are stored at the same time as DTC P0420, troubleshoot those DTCs first, then recheck for DTC P0420.
P0137, P0138: Secondary HO2S (Sensor 2)
P0141: Secondary HO2S (Sensor 2) heater
1. Reset the ECM/PCM.
2. Start the engine. Hold the engine at 3,000 RPM with no load (in Park or neutral) until the radiator fan comes on.
3. Test-drive at 50-55 mph (80-88 km/h) for about 2 minutes. Then decelerate for at least 4 seconds with the throttle completely closed. Then accelerate to 55 mph (88 km/h), and try to hold it until the scan tool indicates FAIL or PASS as the TWC test result.
Is the test result FAIL?
YES - Check the three way catalytic converter (TWC). If necessary, replace the TWC.
NO - Intermittent failure, system is OK at this time.
© 2008 Mitchell Repair Information Co., LLC.
NOTE:
If some of the DTCs listed below are stored at the same time as DTC P0420, troubleshoot those DTCs first, then recheck for DTC P0420.
P0137, P0138: Secondary HO2S (Sensor 2)
P0141: Secondary HO2S (Sensor 2) heater
1. Reset the ECM/PCM.
2. Start the engine. Hold the engine at 3,000 RPM with no load (in Park or neutral) until the radiator fan comes on.
3. Test-drive at 50-55 mph (80-88 km/h) for about 2 minutes. Then decelerate for at least 4 seconds with the throttle completely closed. Then accelerate to 55 mph (88 km/h), and try to hold it until the scan tool indicates FAIL or PASS as the TWC test result.
Is the test result FAIL?
YES - Check the three way catalytic converter (TWC). If necessary, replace the TWC.
NO - Intermittent failure, system is OK at this time.
© 2008 Mitchell Repair Information Co., LLC.
Feb 18, 2011 at 3:30 PM
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