Question about 2000 Chevrolet Silverado 1500

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Running lean on bank 1 and bank 2 codes 171 174 runs great when codes are off once they come on loss of power not much but you can feel it

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P0171 - System Too Lean (Bank 1)

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 the engine that has cylinder #1.

Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

Symptoms: You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.


Causes: 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 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


Hope helps.

Posted on Mar 24, 2011

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Code 171 is left bank, 174 is right bank. shows low fuel pressure.change fuel filters lately?? ok before we condemn the fuel pump ,better hookup pressure Guage and check pressure. Can be caused by a vacuum leak. to check, with spray engine cleaner in suspect areas and note of any engine changes. be care full not to spray exhaust areas or it might flame up, do not use brake clean if it gets into engine intake then as it comes out the exhaust it is very poison to breathe . and very dangerous if inhaled

Posted on Mar 24, 2011

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Posted on Jan 02, 2017

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SOURCE: running lean on bank 1 & 2 runs great when no

You might try to check the EGR valve

Posted on Mar 24, 2011

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1 Answer

What does a lean on a bank mean


It would depend greatly on which bank, if both bank are running lean I would suspect a MAF If only one bank is lean then I would suspect a intake manifold gasket. what Code or Codes do you have?

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Code 171 and 174 are for bank 1 and 2 running too lean. The engine has compensated as rich as it can go, and it is still to lean. This does not necessarily mean your mixture is bad, but something (a sensor) is telling the ECM to correct lean. The oxygen sensors alert the ECM to how lean/rich the exhaust is, and then the ECM trips a code. Maybe you have a bad oxy. sensor, but since there are 4 of them (2 per bank), I don't think they could all go at once.

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Codes- P0171, P0174, P2106, P0351, P0355 and P061C the car is a 2006 ford five hundred. The car runs good at times. any suggestions?


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P0174 System too Lean (Bank 2)
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May be your car run normally now, but you must check and repair the fault in advance.
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1999 Ford Explorer XLT 4.0 SOHC 4x4 code P1151 bank 1


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On my 2002 yukon 1500 I have trouble codes of 171,174, 420 what is my problem


Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 2 is generally the side of the engine that doesn't have cylinder #1.
Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.
You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
I hope this helps.

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2001 yukon codes causes banks 1 and 2 to run lean?


If bank one and two are running lean problem is the Mass Air Flow Sensor (MAF) Dirty or Defective.

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03 impala, Car has minimum power 0-30 and then full power...Why?


if it said bank 1 lean, probaly it is an o2 sensor, but if bank 1 and 2 are lean then you have a vacuum leak. a hose or the intake. was there 1 code or more?

Aug 12, 2009 | 2003 Chevrolet Impala

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Check engine light is on,codes 171,174,system lean,codes came back as 2 oxygen sensor's before cat/conv,do they need to be replaced or could it be something else causing it, any help would be great!!!


O2 SENSORS ARE BAD MOST LIKELY I WOULD CHANGE THEM DISCONNECT THE BATTERY FOR 5 MIN. ( IF YOU DONT HAVE A SCANNER) THIS WILL RESET YOUR COMPUTER AND SHOULD MAKE THE SERVICE ENGINE LIGHT GO OUT.

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3 Answers

1995 Windstar OBD II showing codes PO340, PO171, and PO174.


Symptoms of a faulty Camshaft Position Sensor can include hard starting (or no starting), rough running/misfiring and/or loss of power.

Code 340 COULD be caused solely by a faulty Camshaft Position Sensor. However, this code refers to the entire circuit. So, replacing the sensor may not fix the issue. The problem could lie in any part of the circuit - the sensor itself, the wiring, or the PCM.

Codes 171 and 174 typically appear together. They are caused by the 02 sensors reading too much air (lean) in the exhaust. In most cases, simply cleaning the MAF sensor does the trick. I typically take it off and spray it with electronics or brake cleaner. Just make sure it dries before reinstalling. If this doesn't eliminate the codes, inspect all vacuum and PCV hoses, check for a dirty fuel filter and ensure the furl pressure is within limits.

For clarification, the first trip to the shop your car showed codes 402, 732, 733, 171 and 174. After changing the DPFE/EGR, did ALL those codes go away and now only codes 340, 171 and 174 exist? Or do you have the second set of codes in addition to the first codes?




Jan 15, 2009 | 2001 Ford Windstar

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