Question about Mazda MPV

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My 2002 mpv has a p0174 bank 2 lean code. is the cause of this code possibly an o2 sensor ? Or what else could be causing it ? thanks.

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  • brad hamilton Mar 27, 2011

    Thanks for the info tried that already and the code came back again any other idea's. Iv'e read that it could be fuel cap or possibly pvc hose . thanks

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More than likely a dirty MAF sensor (Mass Air Flow) It's the large round air intake with wires going to it. It requires special MAF sensor cleaner - DO NOT use spray carb cleaners as you will damage it.

Posted on Mar 25, 2011

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Can .p1151, .p0174, p0401, .p0153 all be related


Not exactly.
Codes 1151 - 174 - 153 all point to a faulty O2 sensor bank 2 sensor one. That is the sensor ahead of the catalytic converter. All three codes state the sensor is reading the fuel mixture is too lean. It could be lean but you should also have codes for the sensor on bank one.
Code 401 is for a low air flow for the EGR valve which would probably be a different issue. Its possible the EGR valve is faulty and that could affect the fuel mixture but usually for the EGR to cause a lean mixture the EGR would cause a vac leak not fail to open.

Oct 02, 2012 | 1997 Ford Ranger SuperCab

1 Answer

Code po171 system too leen bank 1


DTC 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 (Diagnostic Trouble Code) is very similar to P0174, and in fact your vehicle may show both codes at the same time.

I would suggest that you take a look at the front oxygen sensor. Typically speaking the oxygen sensor causes this code to appear. Here is the possible cause list from the manual for your car.

Trouble Code: P0171 - Fuel System Lean (Bank 1)

Possible Causes:
Air leaks in intake manifold, exhaust pipes or exhaust manifold
Base engine mechanical problem causing a lean A/F condition
Fuel control Sensor is out of calibration (e.g., ECT, IAT or MAP)
Fuel delivery component fault (clogged filter, low fuel pressure)
O2 element is contaminated, deteriorated or it has failed
Vacuum hose is disconnected, broken, leaking or loose

Hope this helps (remember to rating this answer ans leave us a testimonial comment). Thank you for using FixYa.

Oct 12, 2011 | 2000 Ford F150 Flareside SuperCab

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

What does error code p0172 and p0174?


P0172 - Fuel Injection System Too Rich Bank 1 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connec
Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem.



P0174 - Fuel Injection System Too Lean Bank 2 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection
Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem. Bottom line possible defective Mass airflow sensor and or O2 sensor in cylinder bank number two.

Feb 21, 2011 | 1998 Ford Expedition

2 Answers

Codes171 174


Do you mean codes P0171 and P0174? The 4.6L and 5.4L engines have problems with the rubber boot that connects the PCV tube to the back of the air plenum assembly. The rubber boot deteriorates and gets hols in it which causes lean O2 Sensor codes on both banks. The PCV Valves themselves also fail, causing the same codes. (These are the most common causes) The second most common cause is a malfunctioning MassAirflow Sensor (MAF). Severalother things can cause these two codes including any vacuum leak that is on the engine side of the mass airflow sensor, including holes in the intake "snorkel", intake manifold leaks, or any vacuum suply hoses leaking, including the brake booster hose or even a leaking brake booster. Low fuel pressure, caused by any one of several reasons, can also cause these 2 codes. Clogged injectors can also cause these codes, but are not likely to set both of these codes at once. (although it is possible) The least likely cause (although possible) is that both upstream O2 sensors have failed.

Jan 16, 2011 | 2004 Ford F150

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

2 Answers

Fault code p0174 what is the usually problem with this code


P0174 is System Too Lean Bank 'B'. This will almost certainly be an air leak somewhere in Bank B from where the inlet manifold splits into 2 to feed Bank 'A' and 'B', or possibly a leak in the exhaust manifold / catalyst or where the O2 sensors are fitted into the exhaust. Cleaning the MAF is unlikely to make a difference, as if this is the problem you'll either get a lean code for both banks (P0171 and P0174) or a MAF sensor code (P0101). If the O2 sensor is a fault you'll get an O2 sensor code for Bank B, so don't chance an expensive change of this!
A blocked fuel filter won't only give this code (again it'll affect both banks), ditto the air filter.

As regards to only showing up on highway driving, the leak may only be small and only evident at a higher under bonnet temperature.

Feb 26, 2010 | 2003 Jaguar X-Type

1 Answer

P0137 p0171 p0174


P0137 o2 circuit low voltage bank 1 sensor 2 --o2 sensor after the cat converter -check for faulty o2 sensor -short or open circuit exhaust leak near sensor or plugged cat converter ----P0171 and P0174 -system too lean bank 1--and system too lean bank 2 they are usually from the same problem which can be caused from the o2 problem but check ur maf sensor connections and or clean if necessary[carb cleaner] vacuum leak downstream from maf sensor also inspect pcv lines

Feb 16, 2010 | 2003 Chevrolet Silverado 1500

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

2 Answers

Diagonostic trouble codes reported p0171 p0174 p0302 2001 Taurus, only reports P0171


P0171 is system too lean bank 1, P0174 is too lean bank 2, and 302 is misfire bank 1. Look for vacuum leaks. If you don't find them, put a vacuum gage on it can check. The P0171 is almost always a vacuum leak. If not other possibilities are front O2 sensor is too old and should be replaced (if mileage is greater than 100k then replace). Try injector cleaner. Misfires are usually bad spark plugs, but could possibly be caused by insufficient fuel. I've never had a car of mine in bad enough shape to have that error.

Sep 14, 2008 | 2001 Ford Taurus

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