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#1
03-12-2007, 09:42 PM
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1998 SL 500 - P0410 Sec Air Inj Code
I have a 1998 SL500 with 93K miles with a check engine light (code P0410) that keeps coming on. It comes on after driving about 3-4 miles, sitting at a stoplight. The idle stumbles for a second and the light comes on when the secondary air pump kicks in. The dealer replaced the secondary air pump and 1 oxygen sensor about 15K miles ago. I replaced the other oxygen sensors, all the vacuum lines, spark plugs and the secondary air system seems to be working properly (the pump runs at various times). I have cleaned the valves that connect to the vacuum lines and manually operated them with a hand pump or 12VDC. I bought a new code reader and here is the data frozen when the fault last occured:
P0410 Secondary Air System Rpm: 575 Load value 23.1% MAP Sensor 59 KPA Coolant Temp 172 degrees F Short term fuel trim 1 6.2% Long 1 4.6% Short 2 39.8% Long 2 4.6% Short 3 -100.6% Long 3 -100.6% Short 4 -100.6% Long 4 -100.6% It looks like it is running out of fuel on one cylinder bank? Any suggestions? 
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#2
03-13-2007, 08:19 AM
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Most MB scanners can perform an activation of that system & show info on the reaction of the front O2 sensors. Possibly a blockage....
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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