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  1. #1
    Senior Member Two Rings BrianVan's Avatar
    Join Date
    Apr 03 2015
    AZ Member #
    324852
    Location
    Naperville, IL

    Threw a P12A2 Code. This is what is was.

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    After pulling the Engine cover off to investigate low coolant\no heat from vents, I filled up the almost empty reservoir tank, and started the car.
    The engine wouldn't idle smooth and would miss-fire and shutter. Throwing a code found by Carista P12A2 and 05658.

    Code P12A2 = The Engine Control Module (ECM) monitors the Fuel Rail Pressure Sensor. The ECM sets the OBDII code when the Fuel Rail Pressure Sensor is not to factory specifications

    I guess when I pulled the engine cover off, I leaned the cover too far to the right and broke this sensor off.

    After leaning over to look, a bad hissing\sucking sound was heard and the engine cover must of cracked off the sensor on the manifold.
    Placing the sensor back in worked great, but I need to replace the bracket and while I'm at it...the sensor.
    Used some RTV to stick it back in place for now. It's just a friction fit when the bracket is not broken.

    QUESTION. What sensor is this? Looking at numerous google pics diagrams and searching the code. There isn't any definite answer.



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    2013 B8.5 A4 Quattro Auto| Ice Silver | RS4 Grill and Fogs | Painted Calipers Gunmetal | R1 Concept Rotors Drilled\Slotted | Ceramic Pads | Audi Puddle Lights | LED Interior Lights | RS4 Pedals | ECS Drivetrain Mounts |Luft-Technik Intake | Red Coil Paks | Plasti-Dip Rear Emblems | Carista | Spacers 12.5Front 25Rear | ST Coilovers | Ceramic Paint Protection | Lamin-X Tail Light Tint GunSmoke |

  2. #2
    Veteran Member Four Rings
    Join Date
    Jul 16 2018
    AZ Member #
    422473
    Location
    Atlanta

    2009 A4 Avant 2.0T quattro Prestige, 275k miles

  3. #3
    Senior Member Two Rings BrianVan's Avatar
    Join Date
    Apr 03 2015
    AZ Member #
    324852
    Location
    Naperville, IL

    Quote Originally Posted by Smac770 View Post
    THANK YOU bruh.....I searched and searched...ordered and coming soon....
    2013 B8.5 A4 Quattro Auto| Ice Silver | RS4 Grill and Fogs | Painted Calipers Gunmetal | R1 Concept Rotors Drilled\Slotted | Ceramic Pads | Audi Puddle Lights | LED Interior Lights | RS4 Pedals | ECS Drivetrain Mounts |Luft-Technik Intake | Red Coil Paks | Plasti-Dip Rear Emblems | Carista | Spacers 12.5Front 25Rear | ST Coilovers | Ceramic Paint Protection | Lamin-X Tail Light Tint GunSmoke |

  4. #4
    Veteran Member Four Rings Spawne32's Avatar
    Join Date
    Nov 20 2016
    AZ Member #
    386232
    Location
    NJ

    Your IAT is broke, but it looks like you need a fuel rail pressure sensor too there my man. lol

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