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?
P1174 - Fuel trim adaptive malfunction (Bank 1)
P1175 - Fuel trim adaptive malfunction (Bank 2)
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.
Is that not the error?
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Two possibities. Oxygen sensor or vacuum leak.
Check all the intake rubberhoses first.
Spray some breakcleaner to those, if the motor revs, you found the broblem.
If not, its possible bank one oxygen sensor.
"Fuel trim; bank 1 - range/performance problem."
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.
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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Nothing to do with bmW
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