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Old 05-10-2003, 03:45 AM
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Unhappy 1999 C280 - Code P0170, 173 will not go away. Help!

diagnosing a check engine light on a 1999 C280 benz. failed smog (basic), found code P0170/173. Saw the same code on a 1999 E430 (replaced fuel filter) cleared codes, roadtest, concern solved. Not so with the C280. keep finding the same code. Tune up specs in good condition, no vaccum leaks, all o2's working normally. I Am stuck! Leaning toward possible partially restricted twc? Help! This is a sold unit!!!!
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Old 05-10-2003, 09:14 PM
Junior Member
Join Date: May 2003
Location: Jersey
Posts: 9
Had a clk with three injectors not firing (stuck) at idle causing a lean condition at idle, with those codes. replaced injectors ok just a thouht.
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Old 05-11-2003, 09:42 PM
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Join Date: Sep 2002
Posts: 2,485
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Old 05-11-2003, 10:16 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Look at your adaptive values. The typical figures for mad air mass meters is 1.32 on the lower or upper partial.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 05-11-2003, 11:19 PM
Senior Member
Join Date: Apr 1999
Location: Walnut,CA,USA
Posts: 554
I agree with ILUVMIL & STEVEBFL MAF,MAF,MAF..........................MAF
MB STARS Master Guild Technician,17 years MB tech
14 years independent shop owner
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