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W210 P170 & P173 Codes. Help!
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09-09-2017, 08:31 AM
97 SL320
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Join Date: Jan 2012
Posts: 7,534
An unmetered air leak could cause the fuel trim to push the system towards rich. Unmetered air is anything past the MAF.
High fuel pressure / liquid fuel leaking from pressure regulator to intake manifold could cause fuel trim to push towards lean.
97 SL320
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