Question about Mazda Cars & Trucks

1 Answer

P0174 and p0171

My mazda MPV 2004 just failed emissions due to 2 codes 0171 and 0174, what needs to be fixed/

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Mazda Master
  • 21,873 Answers

Well it depends on what the problem is.
The two codes are for the fuel system being too lean on both banks. You have an O2 sensor on each bank that sends data to the computer telling it if the fuel mixture is too rich or too lean. The computer adjusts the on time for the injectors based on that and other data.
The most common reason you would get those two codes at the same time is low fuel pressure. So the fuel pressure would need to be checked along with the O2 sensors.

Posted on May 02, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

SOURCE: 1999 ford taurus emission reading p0171 and p0174

just tune up ur car periodicly, clean filter. clean ur sparkplug.

Posted on Jan 16, 2009

  • 1129 Answers

SOURCE: codes P0171, P0174, P0440

This is usually an oxygen sensor, replace the O2 sensor located above the catalytic converter before replacing the evaporator purge canister.

Posted on Dec 29, 2009

  • 78 Answers

SOURCE: 2003 Mazda MPV ES that idles very rough when warm

that means could be vacuum leak

Posted on Jan 10, 2010

  • 67 Answers

SOURCE: Failed state emissions test with codes P0171 &

Sensors are reporting that car is running to lean...Check sensors...

Posted on Feb 15, 2010

  • 1 Answer

SOURCE: Failed emissions test Trouble codes P0171

Trouble codes P0171 & P0174

Posted on Mar 08, 2011

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Im getting P0171 code- lean .


About 259,000 results (0.64 seconds) Search Results

    obd ii - 'Check Engine' code P0171 System Too Lean - Is it ...

    mechanics.stackexchange.com/.../check-engine-code-p0171-system-too-l...
    Feb 11, 2014 - 'Check Engine' code P0171 System Too Lean - Is it safe to drive? ... My question is: is it okay to drive my car while it shows these codes? ... This will cause you to get increasingly worse fuel mileage. ... I am going to defer to your expertise, but I just want to ask if you've considered that lean-running engines ...

    P0171 and P0174 - OBD-II Trouble Codes - RepairPal

    repairpal.com > Encyclopedia > OBD II Codes
    Definition of error code P0171 and P0174 - System too Lean (Bank 1 and Bank 2). ...Before we get into the main causes of P0171, let's explore why this code matters. ..."Lean" running cars and light trucks are highly polluting vehicles. Most of ...

    Mazda tribute codes p0171 - Cars & Trucks 'Cars & Trucks

    www.faqqq.com/.../mazda-tribute-codes-p0171-cars-trucks-cars-trucks-6...
    Question Product: Cars & Trucks Question Details: Mazda tribute codes p0171 ... I am getting the following (4) codes in a 2003 Mazda Protege5 engine: P0090 ...

    P0171 Code thrown while idle - Toyota Nation Forum : Toyota Car ...

    www.toyotanation.com > ... > Yaris/Scion iA, Vitz and Echo Forum

Jan 27, 2016 | Cars & Trucks

1 Answer

My problem in the type of car Santa Fe at 2007 3.3L examination give code p0174


Stuck with these codes P0174 and P0171..need help - Hyundai Forums ...

www.hyundai-forums.com/.../237193-stuck-these-codes-p0174-p0171-n...

Feb 12, 2014 - 10 posts - ‎6 authors
I've been getting these codes for awhile now which are p0174 "ECM has detected ... 06 Sonata LX 3.3L V6 ... the fact that your FE has gone down could indicate something else as .... 2014 Santa Fe Sport 2.0T AWD w/ Tech Package ... Join Date: Jul 2007 ...More on PowerTorque Tools - Hex Bits Set - SAE ...Missing: examination

p0171 p0172 p0174 p0175 p2187 p2188 p2189 p2190 - Page 2 - Hyundai ...

www.hyundai-forums.com/.../336641-p0171-p0172-p0174-p0175-p21...

Dec 25, 2014 - 10 posts - ‎3 authors
today one of my colleague who have same car sonata 2007 but with 4 cylinder.for checking ... Drives hyundai accent 2005(sold) Drives Hyundai Sonata 2006 v6 3.3L ...Due to it throwing codes for both rich and lean and after finding a thread searching those.... More on UltraSteel - Magnetic Nut Driver Set.Missing: examination

santa fe won't start, what is most likely wrong? - CarGurus


Jan 04, 2016 | Cars & Trucks

2 Answers

It failed the emissions test. What do the following codes mean? P0171 and P0174


PO171 System too Lean Bank
P0174 Fuel Injection System Too Lean Bank 2

If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.

Mar 13, 2015 | 2002 Ford Windstar

1 Answer

2004 MAZDA MPV P0171


The code is for fuel system lean bank one. That means the computer can not make the engine run rich enough to get the O2 sensor to switch from lean to rich.
It should also set a code for the cylinder miss, the problem could be dirt in the fuel filter or a problem with one of the injectors based on your statement about running low on fuel. It could also be a low fuel pressure problem due to stuff clogging up the screen in the gas tank. Sometimes the problem is the O2 sensor but I doubt it in your case.
You could try replacing the fuel filter and running some injector cleaner thru the fuel system to start with. The code needs to be cleared after the miss is repaired to see if the light will stay off.

Sep 01, 2012 | 2004 Mazda MPV

2 Answers

2004 suzuki verona emissions issue. Check engine light stays on. Shows no error codes, says mixture lean. Can you give a solution?.


A few things to check:
1. A bad intake manifold gasket
2. A missing O ring gasket between the air filter cover & the MAF sensor.
3. A dirty fuel filter.

What's the code? P0171 & P0174 would indicate a vacuum leak. P0171 could be the MAF sensor. Good luck, I'm still fixing all my Verona's annoying "quirks".

Feb 20, 2012 | 2004 Suzuki Verona

1 Answer

I took my cadillac catera for an emissions test and it failed. They said it failed due to these to codes: P0171 and P0174. What do the codes mean?


Diagnostic Test Code (DTC) P0171 and P0174 are both "LEAN OXYGEN SENSOR" codes. One is for one side of the engine and the other is for the other side of the engine.

To put it simply, you have too much oxygen in your exhaust on BOTH sides of the engine at the same time.
This can be caused by a number of things including vacuum leaks, low fuel pressure, or a bad Manifold Absolute Pressure (MAP) sensor or Mass Air Flow (MAF) sensor.
This should be diagnosed using a scan tool that can read fuel trim data so that an effective repair can be made and verified.

Please note that it is HIGHLY UNLIKELY that these codes are being caused by the oxygen sensors themselves.

Please also review this article:
What Else Could Be Wrong?

Aug 25, 2011 | 2001 Cadillac Catera

1 Answer

What does code P0174 and P0304 mean


PO304--is # 3 cylinder misfiring
PO174---is a lean O2 Sensor Code on bank 2,
from the misfire


So you find the cause, of the ignition misfire,and NO,
it is not spark plugs,wires and a long list of parts, that
never fail.

It is a bad ignition coil or igntion module,which ever applies.

Dec 01, 2010 | 2004 Mazda MPV

1 Answer

My 2004 MPV shaking so bad, specially when stepping on the brake at reverse or drive, and before that, the engine light was on. What do you think the problem was?


Hopefully this may be of use to you. I've just had similar symptoms with a 2003 MPV. It shook when it warmed up and with brakes applied. It also turned the check engine light on with codes P0171, P0174 and P0300 which were bank 1

Aug 31, 2010 | 2004 Mazda MPV

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

176 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mazda Experts

yadayada
yadayada

Level 3 Expert

75051 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7726 Answers

Are you a Mazda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...