Rough idle, surges.and sometimes runs rough on throttle - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 6 (permalink) Unread 06-18-2019, 02:52 AM Thread Starter
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Rough idle, surges.and sometimes runs rough on throttle

I have a 2005 6 s wagon with only 91,500 miles. It fires up right away but runs rough even though I changed the coil packs, plugs and air intake tube. I also checked for vacuum leaks. It throws P2179 and P2189 codes. Could it be the O2 sensors, purge or EGR valve, PCV or...? I'm at wit's end--any help would be greatly appreciated!
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post #2 of 6 (permalink) Unread 06-18-2019, 08:45 AM
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Clean the MAF and see what happens.

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post #3 of 6 (permalink) Unread 06-18-2019, 10:46 AM
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  1. P2189 System Too Lean at Idle (Bank 2) - OBD-Codes.com

    www.obd-codes.com/p2189





    • WHAT DOES THAT MEAN?
    • SYMPTOMS
    • POTENTIAL CAUSES OF P2189 DTC
    • DIAGNOSTIC / REPAIR STEPS
    • RELATED DTC DISCUSSIONS
    • NEED MORE HELP WITH A P2189 CODE?


    <li class="b_algo" data-bm="6">
    • This diagnostic trouble code (DTC) is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model.This is an ambiguous code in of itself. It can be a tough code to crack without a diagnostic strategy. During the last two starts, the engine management computer has recognized a problem with the fuel mixture at an idle. It appears that the fuel mixture is t...
    See more on obd-codes.com




    <li class="b_algo" data-bm="7">P2179 System Too Lean Off Idle Bank 2 - OBD-Codes.com

    www.obd-codes.com/p2179





    • WHAT DOES THAT MEAN?
    • SYMPTOMS
    • CAUSES
    • DIAGNOSTIC AND REPAIR PROCEDURES
    • RELATED DTC DISCUSSIONS
    • NEED MORE HELP WITH A P2179 CODE?


    • This generic powertrain/engine diagnostic trouble code typically applies to fuel injected engines from most European and Asian manufacturers since 2010. Those manufacturers include but are not limited to Volkswagen, Audi, Mercedes, BMW/Mini, Hyundai, Mazda, Kia and Infiniti. You may also experience this trouble code on other makes such as Dodge.This code is mostly concerned about the value provided by the air/fuel ratio sensor, more commonly called an oxygen sensor (located in the exhaust) wh...
    See more on obd-codes.com



  1. Mazda 6 P2179 (system too lean off idle, bank 2), P2098 ...

    www.fixya.com/cars/t27356179-mazda_6_p2179_system_lean_off_idle_bank
    P2179 - System Too Lean Off Idle Bank 2 I am not sure what your Mazda is, but from the sounds of it, both of your Oxygen Sensors are shot. Replace them both, or check for vacuum leaks. It may be a good time to inspect and replace the PCV Valve and PCV Valve hose, too.

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post #4 of 6 (permalink) Unread 06-18-2019, 07:17 PM Thread Starter
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Much mahalo/thank you. That was MY fixya post! &#x1f609;
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post #5 of 6 (permalink) Unread 06-19-2019, 01:43 AM Thread Starter
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Quote:
Originally Posted by jman1200 View Post
Clean the MAF and see what happens.
Cleaned the MAF and replaced the air inlet duct (had a small tear). The idle and throttle changed a little, but it still runs rough. Thanks!
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post #6 of 6 (permalink) Unread 06-19-2019, 01:57 AM Thread Starter
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Quote:
Originally Posted by idrive View Post
  1. P2189 System Too Lean at Idle (Bank 2) - OBD-Codes.com

    www.obd-codes.com/p2189





    • WHAT DOES THAT MEAN?
    • SYMPTOMS
    • POTENTIAL CAUSES OF P2189 DTC
    • DIAGNOSTIC / REPAIR STEPS
    • RELATED DTC DISCUSSIONS
    • NEED MORE HELP WITH A P2189 CODE?


    <li class="b_algo" data-bm="6">
    • This diagnostic trouble code (DTC) is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model.This is an ambiguous code in of itself. It can be a tough code to crack without a diagnostic strategy. During the last two starts, the engine management computer has recognized a problem with the fuel mixture at an idle. It appears that the fuel mixture is t...
    See more on obd-codes.com




    <li class="b_algo" data-bm="7">P2179 System Too Lean Off Idle Bank 2 - OBD-Codes.com

    www.obd-codes.com/p2179





    • WHAT DOES THAT MEAN?
    • SYMPTOMS
    • CAUSES
    • DIAGNOSTIC AND REPAIR PROCEDURES
    • RELATED DTC DISCUSSIONS
    • NEED MORE HELP WITH A P2179 CODE?


    • This generic powertrain/engine diagnostic trouble code typically applies to fuel injected engines from most European and Asian manufacturers since 2010. Those manufacturers include but are not limited to Volkswagen, Audi, Mercedes, BMW/Mini, Hyundai, Mazda, Kia and Infiniti. You may also experience this trouble code on other makes such as Dodge.This code is mostly concerned about the value provided by the air/fuel ratio sensor, more commonly called an oxygen sensor (located in the exhaust) wh...
    See more on obd-codes.com



  1. Mazda 6 P2179 (system too lean off idle, bank 2), P2098 ...

    www.fixya.com/cars/t27356179-mazda_6_p2179_system_lean_off_idle_bank
    P2179 - System Too Lean Off Idle Bank 2 I am not sure what your Mazda is, but from the sounds of it, both of your Oxygen Sensors are shot. Replace them both, or check for vacuum leaks. It may be a good time to inspect and replace the PCV Valve and PCV Valve hose, too.
Much mahalo/thank you. That was MY fixya post! &#x1f609;
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