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P1420 Diagnostic Trouble Code Discussion for June 2009

NOX Adsorptive Catalytic System Efficiency Too Low

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Trouble Ticket Help Requests for DTC P1420
Help Request Posted
1999 Mercedes-Benz SLK230 Kompressor 2.3L Poor performance VIN: WDBKK47F0X
P1420: Air pump switchover valve. ... Cleared and the P1236 comes back as pending. Research on archives pointed a lot of directions with many suggesting the K40 relay box. This thing has the supercharger on at idle and this car is a dog while driving. Need help...
June 18, 2009