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#1
05-30-2008, 03:07 PM
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Code P0170 and P0173
I have CLK320 year 2000 and I am getting engine light. I went to Auto Advance parts store and they check engine light and it shows code P0173 Fuel trim malfunction (Bank 2) and P0170 Fuel trim malfunction (Bank 1). Please help me what that means and what parts do I have to buy and where to install. Thanks,
It also says DTC that cause frezze frame P0173 
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#2
05-30-2008, 06:43 PM
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it means that your engine management system has spent all the addative capability is has to correct most likely a lean mixture. Proper diagnostics require looking at the adaptive values. Or you could throw an air mass meter at it. Does it fall on its face above 4000rpms full throttle? If it doesn't try clearing the adaptations and try it again. Your system has teh ability to add 32% more fuel than the algorithym would calculate from the inputs it receives.
That is a lot of fuel. It it weren't so dynamic it almost could run with no inputs and only adaptation. Marvelously adaptable, but there are limits.
__________________
Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician
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