Question about 2004 Mazda MPV

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I have 2004 mazda mvp 3.0L DOHC I have check engine ligth codes MAF sensor, air temperature sensor,TPS, and lean conditions on both banks. I replace the mass air flow sensor and PCM and I steel have the problem the intake air temperature sensor is reading -15 F.

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  • Anonymous Feb 17, 2009

    2002 Mazda MPV. Same problem. Replaced Mass Air Flow Sensor yesterday. Now temperature is off.

  • Anonymous Mar 27, 2014

    I understand that this code means: MASS Airflow Sensor signal inconsistent with TPS. What do I need to fix??

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Have you replaced your PCV hose? If it gets sucked in it will cause a lot of problems.

Posted on Feb 25, 2009

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Where is the mass air flow sensor on a 04 grand am se


You said in your comment above:
"bank one is lean would that be the air flow sensor or an 02 sensor?"

Obviously you have the V6 engine and if bank one is lean and bank 2 is running correctly then it cannot possibly be due to the MAF. The MAF monitors air flow to the entire intake and cannot cause a lean condition isolated to one bank - just 3 of 6 cylinders.

It is unlikely to be an 02 sensor either and that can easily be tested for bank one. In fact it will be the oxygen sensor on bank one that is detecting the lean condition.

I would want a decent scan done on the engine and I would have a good look at the fuel trim readings, oxygen sensor data among others to see what irregularities are going on with bank one. I would also want to check that there were in fact NO issues with bank 2 which has not triggered the same lean fault apparently.

In your case, if only bank one has the lean condition I would suspect there is a vacuum leak only affecting bank one causing the lean condition but that will not be proven until more information is available.

Or you can just replace parts without identifying the true problem and hope for the best which I would not recommend.

Jan 09, 2016 | Cars & Trucks

Tip

Rough engine idle and Lean DTC codes caused by split air intake


Check the 5" wide rubber air intake hose at the convolutes for splits that allow unmetered air into the engine. When this happens, the MAF sensor does not know this air is flowing into the engine, so it leans out the mixture generating DTC codes for Lean, Bank 1 & Bank 2.<br /><br />Use duct tape for a temporary fix and buy a new air intak hose. This hose runs from air cleaner box to engine throttle body.

on Oct 30, 2010 | Mazda MAZDA6 Cars & Trucks

1 Answer

What is the dianosis of a 2004 Expedition/ with the (dtc) PO171.


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.

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.


Hope this helps.

Oct 03, 2011 | 2004 Ford Expedition

1 Answer

Check engine light is on. Does replacing the oil filter fix the problem? The codes are: P171, P174


very Unlikely this will have any affect. sounds more like an air leak to me.
You will find all codes available at http://www.bluejag.co.uk/decode.php



Fault Code:- P0171 Indicates a Power-train fault


The fault is generally due to a problem in the Emission Management (Fuel or Air) area


Fault Description: Bank 1 combustion too lean

Action of ECM:- ECM Default:- Bank 1 catalyst warm-up ignition ****** inhibited- Bank 1 closed loop fuel metering inhibited- Canister purge inhibited- Maximum engine speed reduced


After clearing the DTC, complete the Start engine and bring to normal operating temperature> 82 °C (180 °F) Idle for 10 minutes
Check for a reoccurrence of fault DTC.


Possible Fault:- Engine misfire Air intake leak between MAF Sensor and throttle Fuel filter / system restriction Fuel injector restriction Low fuel pump output HO2 Sensor(s) (1/1, 1/2) harness wiring condition fault Exhaust leak (before catalyst) ECM receiving incorrect signal from one or more of the following components: ECT Sensor, MAF Sensor, IAT Sensor, TP Sensor
Fault Code:- P0174 Indicates a Power-train fault


The fault is generally due to a problem in the Emission Management (Fuel or Air) area


Fault Description: Bank 2 combustion too lean

Action of ECM:- ECM Default:- Bank 2 catalyst warm-up ignition ****** inhibited- Bank 2 closed loop fuel metering inhibited- Canister purge inhibited- Maximum engine speed reduced


After clearing the DTC, complete the Start engine and bring to normal operating temperature> 82 °C (180 °F) Idle for 10 minutes
Check for a reoccurrence of fault DTC.


Possible Fault:- Engine misfire Air intake leak between MAF Sensor and throttle Fuel filter / system restriction Fuel injector restriction Low fuel pump output HO2 Sensor(s) (2/1, 2/2) harness wiring condition fault Exhaust leak (before catalyst) ECM receiving incorrect signal from one or more of the following components: ECT Sensor, MAF Sensor, IAT Sensor, TP Sensor

Sep 09, 2011 | 2004 Jaguar X-Type

1 Answer

Engine check light on error code 1 is P0171 system too lean bank 1 error code 2 is P0174 system too lean bank 2


P0171 system too lean bank 1
P0174 system too lean bank 2
links to information on the codes

it means that the O2 sensors in your vehicle detected a lean condition in their respective banks. this could be caused by a dirty MAF (mass air flow) sensor or a vacuum leak downstream from the MAF sensor

sometimes you can clean the MAF with electronics cleaner or brake cleaner but be sure to take it off the vehicle first. be careful not to damage the MAF while spraying the cleaner, and allow it to dry completely before installing it on the vehicle.

May 21, 2011 | 2001 Jaguar S-Type

2 Answers

My truck is showing codes 171 and 174. Can you help


P0174 Generic Definition

Fuel Trim Bank Two Condition
- The ECM has detected a rich or lean air/fuel ratio condition on engine bank two

Probable Cause[s]

  1. If bank one and two are set together suspect a fuel pressure condition or MAF sensor fault
  2. Failed HO2S21
  3. Ignition misfire condition
  4. Fuel injector problem
  5. Engine mechanical condition




    P0171 Generic Definition

    Fuel trim bank one condition
    - The powertrain control module uses the oxygen sensor to calculate the air/fuel ratio of the engine. The computer has recognized a rich or lean condition on one engine bank only.

    Probable Cause[s]

    1. If bank one and two codes set together suspect fuel pressure or MAF (Mass Air Flow) Sensor
    2. Oxygen sensor defective
    3. Ignition misfire-repair
    4. Fuel injector problem












      Mar 05, 2011 | 1999 Chevrolet Silverado 1500

      1 Answer

      Cop2004 ford escape idles rough.Has Code P2197Lean bank 2.4and6 Misfire at idle goes away at acceleration. We renewed upper and lower intake manifold gaskets and all kinds of hoses. Replaced the 02...


      Bad injector ?? Bank 2

      Air leaking around injector -driving O2 Lean

      2197--trying to correct for over rich condition

      Coil misfires

      TPS Sensor

      MAF ?

      You need to take out fuel
      at least at idle

      Feb 16, 2011 | 2004 Ford Taurus

      1 Answer

      I cleaned the MAF sensor and wires, I also replaced the MAF sensor. The engine is still hesitating, but only when it is very cold outside. Should I try cleaning the wires again?


      is the check engine light on?

      Do not physically touch the heated wires, they are ceramic coated and sensitive. Only spray tehm With carb cleaner or MAF sensor cleaner.

      It sounds like you are running lean. IF your TPS is adjustable, it may need adjusting. TPS = throttel position sensor. Other than that, a bad intake air temperature sensor or bad upstream O2 sensor should turn on your check engine light.

      Dec 12, 2010 | 2004 Ford Freestar

      2 Answers

      I have a 1997 chevy silverado putting out a code of p0174 what does this mean?


      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.

      A code P0174 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 can 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 its 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

      Jan 10, 2010 | 1999 Chevrolet Silverado 1500

      1 Answer

      04 mazda 6 lean condition


      sounds like you have a vacuum leak. It is sucking in extra air from somewhere. possibly the intake manifold gaskets. The extra air coming in fools the computer / o2 sensors to believe it has a lean mixture then it will try to compensate for the lean mixture and add more fuel.

      Oct 30, 2009 | 2004 Mazda 6

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