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Bigc

Bigc 5/30/2010

1996 Honda Civic DX 4 Cyl 1.60L

Engine

my scanner said syster too lean (bank1) what that mean?

4 Answers


Bill

Bill 2/19/2011

Plugged fuel injector usually. Means not getting enough fuel.

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Joe

Joe 2/19/2011

Vacuum leak or bad oxygen sensor.

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Joe

Bill 2/19/2011

Joe doesn't this mean that Oxygen sensor detected too much oxygen to fuel ratio and sensor doing what supposed to do?

Joe

Bill 2/19/2011

Basically this means that an oxygen sensor in bank 1 detected a lean condition ( too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of ...
http://www.obd-codes.com/p0171

Joe

Bill 2/19/2011

MAF flow sensor

Joe

Joe 2/19/2011

Bill, O2 sensors can give off a false reading as a rich or a lean condition when they go bad, they should be replaced at about 100,000 miles or so. Bank one on a 4 cylinder engine is the upsteam O2 sensor.

J and K AUTOMOTIVE TOWING AND REPAIR

A code P0171 may mean that one or more of the following has happened:

* The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
* There could be a vacuum leak downstream of the MAF sensor.

Possible Solutions

Possible solutions include:

* In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
* Inspect all vacuum and PCV hoses, replace if necessary
* Check for a dirty fuel filter and proper fuel pressure

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HouseCallAuto

HouseCallAuto 2/19/2011

In the interests of not bombarding this DIY person (mechanically inclined person with his own code reader) with extensive tests that can only be carried out with a full function shop grade scanner with all the readings available for fuel trim and MAF grams per second and map sensor readings, I am going to suggest that he replace the Bank 1 sensor 1 (front O2 sensor) and see whether the P0171 code returns, because it could be just a bad O2. And, if it does return, it is not a terrible waste of money to renew the front O2 no matter. So, Bigc, change the front sensor and repost with results. make sure you clear the codes afterward.

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HouseCallAuto

Bill 2/19/2011

Thanks for clarification HCA and Joe

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