Question about 1998 BMW Z3 Roadster

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Check Engine Light Code P1174

Hi,

The check engine light just came on my 1998 Z3. I took it to AutoZone and the code on the machine is P1174. I would like to have some clue as to what the problem is before I take it to the shop. Can anyone help?

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P1174 - Fuel trim adaptive malfunction (Bank 1)
P1175 - Fuel trim adaptive malfunction (Bank 2)

Posted on Jun 02, 2008

  • Matt Jurach
    Matt Jurach Jun 02, 2008

    There is a TSB out on this problem.

    Group 11: Engine
    Bulletin Number: 11 04 97

    Woodcliff, NJ
    November 1997
    Product Engineering

    SUBJECT:
    Intake Air System - Un-metered Air Leaks

    MODEL: E39, E38, E31 with M62 engine

    Situation:
    Check Engine Lamp is illuminated and fault codes 27 (P1174) and 35 (P1175), oxygen sensor control adaptation, are set in the Engine Control Module (DME).

    Cause:
    Un-metered air leaks may occur in the following areas causing the above situation:

    1. Intake manifold gaskets may be leaking.
    2. Plug cap(s) and the vacuum hose for the fuel pressure regulator on the rear intake manifold cover (crankcase ventilation valve) may be torn or missing.

  • Matt Jurach
    Matt Jurach Jun 16, 2008

    Is that not the error?

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"Fuel trim; bank 1 - range/performance problem."

Posted on Jun 16, 2008

  • Ekse Jun 16, 2008

    Possible causes are:- MAF sensor; EVAP can purge valve; coolant sensor; injectors/fuel system; ECU; secondary air, intake, wiring or connexions fault. [The oxygen sensors you've already done.]

    On smaller engined BMW's, the more common P0170/1 fuel trim code is often flagged by a faulty breather valve. Any air leak into the inlet or the exhaust will disturb the precise control of the fuelling and eventually [it's both an additive and multiplicative process] you'll log enough events to flag the code.

  • Ekse Jun 16, 2008

    sorry there is a mistake in my last comment "[The oxygen sensors you've already done.]" It may also be the oxygen sensors.

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Comes on if DME engine management system self diagnostic fault detected. Will stay on until codes are called up and memory erased.

With OBD read the code as follows. Turn on ignition key, press accelerator pedal to the floor five times within 5 seconds. The check engine light will remain on for 5 sec , blik off, come on for 2,5 sec, go off for 2,5 sec and fault code will begin to flash. If more than one fault exist 2nd fault code will be separated by 2,5 sec pause. after fault codes there will be a 0.5 sec flash and light will remain off. to read codes again do procedure again.

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