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Check engine code p0170 - 2001 Mazda Millenia

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P0170- Fuel trim malfunction. This may be triggered by intake hose leaks, vacuum hose leaks or exhaust leaks. Also faulty O2 sensor or corroded O2 sensor connectors. inspect all above!!hopefully this helpd

Posted on Oct 10, 2010

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Posted on Jan 02, 2017

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Molson02536
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SOURCE: CHECK ENGINE LIGHT ON CODE P0170

DTC P0170 applies to fuel trim malfunction on all 2.4L vehicles, 3.0L Federal vehicles and right bank (bank 1) on 3.0L California vehicles. 
DTC P0173 applies to fuel trim malfunction on left bank (bank 2) on 3.0L California vehicles.
DTC Set Criteria (2.4L)

Engine is in closed loop control. Intake air temperature is more than 14°F (-10°C). Barometric pressure is more than 11 psi (76 kPa). Volume Airflow (VAF) sensor output frequency is 88 Hz or more. Code will set if long-range fuel correction is less than -12.5 percent, or more than +12.5 percent, for 5 seconds and short-range fuel correction is less than -10 percent, or more than +10 percent, for 5 seconds. 

Engine is in closed loop control. Intake air temperature is more than 14°F (-10°C). Barometric pressure is more than 11 psi (76 kPa). VAF sensor output frequency is less than 88 Hz. Code will set if long-range fuel correction is less than -12.5 percent, or more than +12.5 percent, for 5 seconds. On 2.4L code will also set if short-range fuel correction is less than -15 percent, or more than +15 percent, for 5 seconds. On 3.0L Federal code will also set if short-range fuel correction is less than -13.5 percent, or more than +13.5 percent, for 5 seconds. 

Have the O2 Sensor changed on the Right Bank, ( passenger side of the Engine, or where the # 1 cylinder is.)
Good luck and hope this helps

Posted on May 02, 2009

  • 58 Answers

SOURCE: 1996 Subaru Outback Engine Code P0170

P0170 Fuel Trim Malfunction (Bank 1), could be fuel filter, mass air sensor, or low fuel pressure.

Posted on Jan 02, 2010

  • 291 Answers

SOURCE: 2001 C320 with 50,000 miles failed Pa Emissions

The codes are for the Mass Air Flow Sensor. It is located between the throttle body and the air filter case. You will see it has a plug in the side. Unplug and remove it by taking the hose clamps off each end. Once you have it out, clean it out with a good throttle body/intake cleaner. Allow it to dry and reinstall. If the light continues to come on, you will need to replace it. Cleaning has worked for some.

Posted on Sep 01, 2009

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    CHECK ENGINE LIGHT ON CODE P0170


    DTC P0170 applies to fuel trim malfunction on all 2.4L vehicles, 3.0L Federal vehicles and right bank (bank 1) on 3.0L California vehicles. 
    DTC P0173 applies to fuel trim malfunction on left bank (bank 2) on 3.0L California vehicles.
    DTC Set Criteria (2.4L)

    Engine is in closed loop control. Intake air temperature is more than 14°F (-10°C). Barometric pressure is more than 11 psi (76 kPa). Volume Airflow (VAF) sensor output frequency is 88 Hz or more. Code will set if long-range fuel correction is less than -12.5 percent, or more than +12.5 percent, for 5 seconds and short-range fuel correction is less than -10 percent, or more than +10 percent, for 5 seconds. 

    Engine is in closed loop control. Intake air temperature is more than 14°F (-10°C). Barometric pressure is more than 11 psi (76 kPa). VAF sensor output frequency is less than 88 Hz. Code will set if long-range fuel correction is less than -12.5 percent, or more than +12.5 percent, for 5 seconds. On 2.4L code will also set if short-range fuel correction is less than -15 percent, or more than +15 percent, for 5 seconds. On 3.0L Federal code will also set if short-range fuel correction is less than -13.5 percent, or more than +13.5 percent, for 5 seconds. 

    Have the O2 Sensor changed on the Right Bank, ( passenger side of the Engine, or where the # 1 cylinder is.)
    Good luck and hope this helps

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