Question about 2003 Ford F150 Regular Cab

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03 f150 4.2 bank 1 and 2 lean

4.2 lean fuel bank 1 and 2

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 52 Answers

SOURCE: check engine light on

Check out this site as it tells you exactly the problem http://www.obd-codes.com/p0171
Hope this helps

Posted on Jan 15, 2009

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  • 5 Answers

SOURCE: Ford Windstar 1996 Trouble Codes P0171, P0141, P0161, and P0174

Bank one is toward the front of the vehicle. Sounds like the heated oxygen sensors have gone bad. The Oxygen Sensors are located in the exhaust pipe and require a special socket to remove and replace.

Posted on Jan 16, 2009

daves944
  • 1050 Answers

SOURCE: vehicle failed emissions testing

You need to replace the intake upper plenum gaskets. There is two pieces, a top cover with one big silicone o-ring gasket and a lower half with six smaller silicone o-rings for the individual intake ports. You can buy these as a set, just for this job. Start this job by removing the wiper blades, then release all the screws, (including the ones that support the wiper motor), that hold that big black plastic valence at the back of the engine compartment. Pull that out of the way, you will have to pull the windshield washer hose through it, just disconnect it on the engine side, now you have access to the plenum. It's a pretty easy job now to remove and replace both halves, just a bunch of 8mm screws hold it all together. Take notes or digital pics along the way so you can pop it all back together. My only caution would be; when you have it apart, do not drop anything in the intake port! I always stuff kleenex in these while I'm working in case something slips out of my hands. Also, don't over tighten, it's all plastic. If you don't want to do it yourself, a shop should charge about an hour and a half, plus the codes must be reset and the van driven until all the monitors are ready.

Posted on Mar 26, 2009

  • 1201 Answers

SOURCE: Diagnostic Codes p0171 bank 1, and p0174 bank 2 (too lean)

Those codes are for the oxygen sensors, lean fuel mixture on both banks. Change them, problem with stalling and rough idle should go away.

Posted on Apr 23, 2009

cellpro0
  • 9 Answers

SOURCE: code po171 and po174. fuel bank 1 & 2

From Twitter by @carpartslocator.

@car_problems oxegen sensor oar the airflowmeter.but i do not know what kind of car you have i am gessing ford....??

Good luck.

Posted on Jul 20, 2009

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1 Answer

Obd2 code p1149


Definition of code P1149:
Acura - Primary HO2S (Sensor 1) Circuit Range/Performance Problem
BMW - HO2S 2 Bank 2 Signal Too High
Chrysler/Dodge/Jeep - Fuel Injector Group 2 Supply Voltage Circuit
Honda - Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range / Performance Problem A/F sensor 03 - 020 6 of 10,or Air / Fuel Ratio Sensor (Sensor 1) Circuit Lean Range A/F sensor
Mercedes - Left Manifold pressure sensor (B28/1)Volkswagen/Audi - O2 Control (Bank 1) Out of range
Volvo - O2 Control (Bank 1) Out of range
Ford - GENERATOR 2 MONITOR CIRCUIT HIGH
Definition of code P1149

Jun 02, 2015 | Cars & Trucks

1 Answer

What does it mean when it said to lean bank 1


It means that one side of the engine cylinders are running too lean of a fuel mixture Bank one is the left side of the engine. Put a fuel injector cleaner in the gas tank first. Once it has had time to do its work, test again. If it's still lean, then look at the injectors and the control module for a fix.

May 25, 2014 | 2006 GMC Envoy

1 Answer

Engine light on


P0171 ; Fuel Trim System Lean (Bank 1)
P0174; Fuel Trim too Lean (Bank 2)
fuel trim is system to modify injector pulse if system go lean it will go rich when the system is too much lean and is max.rich it code
look for 02 sensor bank 1 and 2 data
hope it helps

Mar 31, 2014 | 2003 Chevrolet Malibu

1 Answer

2007 Hyundai Entourage codes P2187, PP0174,P2189,P2195,P2270,P2272


I've come across these codes before. In almost every case there was an air leak in the intake air hose (hose between the engine air filter & the throttle body). Inspect this hose & tubes attached to it. This is especially true when the lean code includes the comment 'at idle'
P2187 - System too lean at idle Bank 1
P0174 - System too lean Bank 2
P2189 - System too lean at idle Bank 2
P2195 = HO2S Signal Biased/Stuck Lean (Bank 1 Sensor 1)
P2270 = HO2S Signal Stuck Lean (Bank 1 Sensor 2)
P2272 = HO2S Signal Stuck Lean (Bank 2 Sensor 2)

P2187 & P2189 = In order to provide the best possible combination of drivability, fuel economy and emission control, the PCM uses a closed loop air/fuel metering system. The PCM monitors the HO2S signal voltage and adjusts fuel delivery based in closed loop fuel control. Changes in fuel delivery will be indicated by the long-term and the short-term fuel trim values. The ideal fuel trim value is around 0%. The PCM will add fuel when the HO2S signal is indicating a lean condition. Additional fuel is indicated by fuel trim values that are above 0%. The PCM will reduce fuel when the HO2S signal is indicating a rich condition. Reduction in fuel is indicated by fuel trim values that are below 0%. The DTC relevant to fuel trim will be set when the amount reaches excessive levels because of a lean or rich condition

Aug 31, 2011 | 2008 Hyundai Entourage

1 Answer

Codes 171 & 174, Aurora 03 4.0 v8, 123k


Lean fuel trim bank one and bank two, the oxygen is reporting engine conditions, you may have a lean misfire caused by worn sparkplugs, low fuel pressure caused by pluged fuel filter or a failing fuel pump, you are equipt with a MAF(mass air flow) under reporting or taking in false aire from a vacuum leak,you also have a MAP (manifold air pressure sensor) that can under report, For a 2003 the likely canidate for bank 1 and 2 to be lean is a need for a tune up , new spark plugs, the second fuel filter or fuel pump, and mosre likely a MAF cleaning why because when this sensor get dirty it under report the incoming air and gives less fuel. I threw the MAP in the mix but I doubt this would be a problem it monitors the EGR and if there was false air it would detect it and set of a MAP code. and ran the engine rich.

May 08, 2011 | Oldsmobile Aurora Cars & Trucks

1 Answer

What do the codes 1128, 1129, 1133, and 1134 mean on my Porsche Boxter 2001?


code P1128 02 sensor bank 1 lean
code P1129 02 sensor bank 1 lean to limit
code P1133 02 sensor bank 2 lean
code P1134 02 sensor bank 2 lean to limit

fuel system is lean.

Jan 29, 2011 | 2001 Porsche Boxster

2 Answers

P0313;Misfire Detected with low fuel P0171-System too lean{bank1} P0174 System too lean{bank2} drive cycle


P0313 - Misfire Detected with Low Fuel
P0174 -System too Lean (Bank 2).
P0171 -System too Lean (Bank 1).

P0171 and P0174 mean "system too lean" for banks 1

Aug 24, 2010 | 2000 BMW 3 Series

2 Answers

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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