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Trouble Code P0174

I have a 2003 bmw325i its running great but i went to warm it up the service engine lite came on so i took it to the gas station and it was down a quart of oil and they put it on the machine and the p0174 lean b2 code came up the guy turned off the service engine lite and said it was ok to drive so i took it to boston it runs great and the lite is still off . i checked the gas cap also i was womdering i was putting 87 fuel in it and right befor the lite went on i had put in premium gas and then mixed it with some 89 would that have set off that sensor because the car is running fine did not us any more gas than i usually do when i go to boston can you help me

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Possible causes
Intake air leaks
Faulty front heated oxygen sensor
Ignition misfiring
Faulty fuel injectors
Exhaust gas leaks
Incorrect fuel pressure
Lack of fuel
Faulty Mass Air Flow (MAF) sensor Incorrect Positive Crankcase Ventilation (PCV) hose connection

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Posted on Apr 03, 2017

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  • Cars & Trucks Master
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It is not the fuel tank cap or the fuel that causes that error. If it does not come back on you are ok.

Posted on Apr 03, 2017


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Posted on Jan 02, 2017

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SOURCE: 97 jeep wrangler 2.5 running lean

check fuel pressure and check exhaust for leaks. exhaust leaks caqn play with the o2 sensor readings

Posted on Sep 25, 2008

SOURCE: 1999 pontiac grand prix . will not run

If wiggling the wires cured the code, then one of the wires is broken inside the insulation. Pull on each wire one at a time. look for the colored insulation to stretch, this will be the broken wire. For the other car that wont rev up, this is a common when the catalytic concverter is plugged up. This will also cause MAF codes, and in turn, TRAC OFF light.

Posted on Oct 17, 2008

SOURCE: P0171 Code (Lean Fuel Bank 1) Engine light on

you nead to check all you vacuum lines for leaks it sounds like you have a vacuum leak or the o2 sensor is going bad on bank 1 **** i still say vacuum leak

Posted on Nov 23, 2008

  • 4 Answers

SOURCE: 2000 corolla with trouble code po420

If the code has cleared on its own then you need to disconnect the battery and re-connect it. This will clear the codes out of the memory. If you don't want to do this you can go to an auto parts strore and have them hook the little computer up to your car and they can clear out the code as well.

Posted on Sep 02, 2009

  • 1 Answer

SOURCE: 2000 kia sportage trouble code po171 once in

I have 2005 Kia Sportage with a check engine light. No other symptoms. I was told by Kia and Local mechanic that it is the fuel injectors. Error Code states that Fuel injectors are running lean. Put Master airflow- no change. Ran engine test with propane to run rich and trim never changed from 15. Car runs great. Kia dealer said that this is because we use Ethel in gas that it effects the alumium fuel rail delivery to the injectors and that it is necessary to change all of them .Kia Dealer wants $1,000.00 deposit to place order 6 fuel injectors from Kia. (Has anyone heard of that?)Also put fuel injector cleaner in tank.Does anyone have any suggestions before I spend over $1,000.00 to replace all 6 injectors or possible idea of what could be wrong?

Posted on Jan 07, 2010

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