2015 Isuzu NPR-HD 5.2L MIL Lamp on
2015 Isuzu NPR-HD 5.2L engine code p0420 recurring after normal regen. if you perform a slow regen you will get no code and be code free for 160 miles till next requested regen and you get code p0420. clear code and do slow regen no code do a normal regen ...
FIX posted 1/10/2020
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Message Closed w/FIX
Vehicle Data2015 Isuzu NPR-HD
Trouble Codes
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Message Closed w/FIX
Vehicle Data
2015 Isuzu NPR-HD
VIN | JALC4W167F |
Engine | 5.2 L / 4 cyl / DIESEL |
Delivery | Fuel Injection |
Emissions | OBD-II Compliant |
Symptoms | MIL Lamp On |
Occurs | Regen |
Trouble Codes
P0420 | Catalyst Efficiency Below Threshold (Bank 1) |