Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
The cost to diagnose the P1158 BMW code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.
Short term fuel trim (STFT) is a value that indicates how the Engine Control Module (ECM) is adapting the factory programmed fuel map. The fuel map is a lookup table that is referred to by the controller. This is used to govern the correct amount of fuel to inject. This amount depends on the speed and load conditions monitored on the vehicle. The (STFT) Value alters depending on which fuel map load cell the engine is operating during speed and load conditions.
The oxygen sensor is a key part of the fuel trim calculation. If the Oxygen sensor indicates a lean mixture, the (STFT) will be increased above the typical Value. If the Oxygen Sensor indicates a rich mixture the (STFT) will be reduced below the typical Value. In normal operation, the fuel trim values will cycle between a maximum of 10 and -10%. (STFT) which exceed this Value should be investigated.
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