There are at least 5 possibilities!
The air pump MUST run.
The air pump diverter switch-over valve must receive signal & open.
The air injection diverter valves must get vacuum from the switch-over valve.
The diverter valves must open allowing air into the exhaust.
The front oxygen sensors must se that oxygen & react by dropping their output to almost no signal.
Scanners that have a activation feature can perform those needed tests!
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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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