Question about Cars & Trucks
Engine warning light showed. Diagnostics showed " Fuel system Lean B1". It was cleared then after 50 km run, engine warning light shown again. Diagnostic is the same. What is the possible cause/ Much appreciated your feedback
Most likely cause is a O2 sensor on bank one ,try changing the rear one on the bank one
Posted on Dec 27, 2013
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Posted on Jan 02, 2017
According to my research and the BMW master mechanic, basically your oxygen sensor is getting an abnormal reading. The abnormal reading will result in the sensor being unable to adapt beyond its +/- 10% threshold to adapt for the fuel/trim mixture. Therefore, either your car is going to run too lean (not enough fuel) or too rich (too much fuel).
1) Either your pre-cats oxygen sensors are bad.
2) Fuel pressure regulator
3) Leak in the air intake /vacuum system
I would think that it is probably your oxygen sensors. Replace that and you should be good to go. Thanks for rating my response and for using FixYa!
Posted on Jun 30, 2009
Hi. You need to clean the Mass Air Flow Sensor.
This is an easy job.
Get a can of throttle body or brake cleaner spray at your local auto parts store.
Open the hood, and locate the air filter box. follow the tube from the filter box towards the engine. Look for a small black box with 2 screws holding it to the air tube, Remove the wire connector and observe inside the sensor with a flashlight. You will see 2 small wires, and they will appear fuzzy or dirty. Spray the interior with the cleaner until the wires are nice and clean. Do not use compressed air, you will damage the sensor. Put it all back together and drive it.
This will def fix your issue. This is a vey common problem. If you do it yourself, you will save 70 + bucks.
Thanks for choosing FixYa, and a FIxYa rating for my assistance would be greatly appreciated.
Posted on Jan 23, 2009
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Posted on Dec 20, 2010
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P0174 - Fuel Injection System Too Lean Bank 2 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem. Bottom line possible defective Mass airflow sensor and or O2 sensor in cylinder bank number two.
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