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2003 Tahoe Running rough, Idle irratic, Ck engine light on. I put it on a OBD2 code reader and showed p0101 mass airflow sensor and bank 1 and 2 running lean I cleaned the sensor but still having problem should I replace sensor?

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Yes, replace the MAF, then check if the lean condition goes away. It should.

MAF's are sensitive to cleaning. Sometimes it works, other times it doesn't.

Posted on Dec 11, 2009


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2003 mitsubishi outlander rough idle won't stay on and wont run with load

p0134 - Bad O2 Sensor or faulty sensor wiring

p0132 - Bad O2 sensor (Bank 1 Sensor 1)

p0401 - Exhaust Gas Recirculation insufficient

p0113 - Defective intake air temperature sensor/ clogged air filter/ faulty Mass Air Flow (MAF) sensor.

p0101 - Vacuum leak/ defective MAF sensor/ damaged intake manifold gasket

p0107 - Faulty Barometric Pressure sensor or its wiring system

p0758 - Low transmission fluid/ Dirty transmission fluid/ Shift Solenoid B wiring problem or its valve

p0753 - Low transmission fluid/ Dirty transmission fluid/ Shift Solenoid A wiring problem or its valve

p0736 - Transmission problem/ Low transmission fluid/ Dirty transmission fluid/ Shift Solenoid wiring problem or its valve/ Transmission hydraulic control circuit

p0735 - Transmission problem/ Low transmission fluid/ Dirty transmission fluid/ Shift Solenoid wiring problem or its valve/ Transmission hydraulic control circuit

p0732 - Transmission problem/ Low transmission fluid/ Dirty transmission fluid/ Shift Solenoid wiring problem or its valve/ Transmission hydraulic control circuit

p0720 - Damaged speed sensor/ its harness/ connector

Jun 12, 2013 | 2003 Mitsubishi Outlander

1 Answer

Check engine

The first 2 codes are for the Mass airflow sensor. The 0171 code is saying bank 1 is too lean.

You can have an airleak on the intake on the bank 1 side. The extra air will trigger a lean warning because the air/fuel ratio will have a high amount of air versus the amount of fuel. It usually is not a lack of fuel that triggers this code.

Some of the manifiolds are built with extra channels and use parts called runners to spread the air into different chanbers. Sometimes they stick out of position. But take a look at the Mass airflow unit, because it is saying the problem is showing up around its' position.

I hope my solution helps you.

Oct 17, 2012 | 2009 Pontiac G5

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Bmw 2882/3 fault codes present

You most likely have an engine vacuum leak or a defective mass airflow sensor or low fuel pressure. Read the codes with a OBD2 code reader and see what the standard codes are.

Oct 14, 2012 | Cars & Trucks

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2003 kia sedona rough idle--check engine light comes on with codes on 1-3-5-cylinder misfires--plugs have been changed, wires changed----it is a replacement engine which had about 70,000 miles on it with...

The only thingI can say is that there is a problem that is affecting the entire bank on one side of the engine. This automatcally eliminates things like Mass Air Flow (MAF) sensor, Manifold Absolute Pressure (MAP) sensor, Throttle Position Sensor (TPS), Crankshaft Position Sensor (CKP) etc. because failure of these things will affect BOTH banks, not one.

I have seen things like a totally skewed upstream Oxygen sensor on one side cause misfire codes for all cylinders on one bank. It is pretty rare, but it CAN happen. This can usually be verified by graphing the O2 Sensor PIDs for both sensors and comparing the graphs.

If the scaner data should be showing SOMETHING that is not right on one side - i.e. fuel trims, injector pulse width, etc.
I would also be looking into the possibility of one of the cams on that side to be 1 tooth off of the correct timing. This can cause problems while the engine is running and will not necessarily show up on a cranking compression test. One way to verify this is to perform a RUNNING compression test. With a warmed-up engine, pull one spark plug out at a time and check the compression with the engine running. Do BOTH sides, so you can compare the readings. If the entire 1-3-5 bank is lower than the 2-4-6 bank, then valve timing is most likely the cause.

Oct 15, 2011 | 2003 Kia Sedona

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What are codes p0101 & p1153

  • P0101 - Mass Air Flow (MAF) Sensor Performance
  • P1153 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 2 Sensor 1
  • Mar 20, 2011 | 2003 Chevrolet S-10

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    I have a 2000 Hyundai Sonata that runs rough when you start it up. I hooked a code reader to it and it said that system was lean on bank 1 and multi misfire and not reading 02 sensor on bank one. I have...

    time to get the engine properly scanned, real time not code scanner, then you will have the readings from sensore and actuators, diagnose from there

    Dec 14, 2010 | Hyundai Motor 2004 Sonata

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    Tells me that bank (1) p0171 and bank (2) po174 are bad which bank is 1 and which bank is 2

    P0171 and P0174 are lean codes. They do not mean the 02 sensors are bad. The most common cause for this especially when both banks are lean is the plenum gaskets in between the plenum and the heads. They will start to leak and cause a vacuum leak. When they leak bad enough it will flag lean codes and eventually the vehicle will start to idle rough and eventually not idle at all.

    Replacing the gaskets will usually fix this problem. Sometime the intake plenum will warp and need to be replaced as well. Replacing the O2 sensors will not fix this problem.

    I’m happy to assist further over the phone at

    Dec 10, 2010 | 2003 Chevrolet Suburban 1500

    2 Answers

    What are these codes and how do I fix them? P0101 P0171 P0174

  • P0101 - Mass Air Flow (MAF) Sensor Performance
  • P0171 - Fuel Trim System Lean Bank 1
  • P0174 - Fuel Trim System Lean Bank 2
  • Would start with the mass air flow sensor the other two codes may have been triggered by the performance of the MAF sensor. Is the vehicle running poorly or have high or low idle?

    Nov 03, 2010 | 2004 Chevrolet Tahoe

    2 Answers

    2003 tahoe

    For p0300 ,p0240 on chevy tahoe 00- 06 check a wire going along with the battery ground to the engine block thre should be a high resistence on the small wire ,it gets corrode over time ,it should be located on underneath of the driver side engine,

    Jul 30, 2009 | 2003 Chevrolet Tahoe

    1 Answer

    I have a 2003 Tahoe. The check engine light is on.

    i would start easy and run a bottle of injector cleaner through it. Good Luck

    Mar 14, 2009 | 2003 Chevrolet Tahoe

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