W210 P170 & P173 Codes. Help!

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.

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