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Old 12-02-2012, 01:32 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by Matt_N View Post
PO171 CNF - Bank 1 System Too Lean
PO174 CNF - Bank 2 System Too Lean
On my M54, I had these codes for a year, until a smoke test tracked 'em down:
- Does the order of the misfire OBDII DTCs diagnostic trouble codes actually matter (1)

Originally Posted by Matt_N View Post
Cleaned the DISA & inspected, ordered new gasket
Can you buy that orange gasket for the DISA at the dealer for the E46? We can't do that for the M54 so we have to second source 'em.

Originally Posted by Matt_N View Post
I think my plan is to continue my journey with a CCV replacement.
This is a good CCV thread if you're interested in testing it first:
- How to test the crankcase ventilation (aka CCV, CVV, PCV, CPV, & OSV) pressure regulating valve system (1)
Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need

Last edited by bluebee; 12-02-2012 at 01:39 PM.
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