Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSAUDI2005A6 3.2 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 16 (3.2L - GENERIC SCAN TOOL, ENGINE CODE: BKH)ST - GENERIC SCAN TOOLDIAGNOSTIC TROUBLE CODE (DTC) TABLESSAE P1XXX DTCSFUEL AND AIR RATIOS, CONTROL MODULE

2005 Audi A6 3.2 T

Fuel and Air Ratios, Control Module

2005 Audi A6 3.2 TSECTION Fuel and Air Ratios, Control Module

WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

DTC

Error Message

Diagnostic Procedure

Malfunction Criteria and Threshold Value

Secondary Parameters with Enable Conditions

Monitoring Time Length

Frequency of checks, MIL Illum

P12A1

Fuel Rail Pressure Sensor Inappropriately High

Check the Fuel Pressure Sensor G247. Refer to → Fuel Pressure Sensor G247 , Checking .

Deviation fuel rail pressure control -0.015 g
And Deviation lambda control -25%

Fuel cut off, Not active
Engine speed, 640-3480 rpm

Time after engine start, >250 sec.
High pressure pump set point, 0.005-0.05 g

Lambda control, Closed loop
EVAP canister load, 25%

5 Seconds

Continuous
2 DCY

P12A2

Fuel Rail Pressure Sensor Inappropriately High

Check the Fuel Pressure Sensor G247. Refer to → Fuel Pressure Sensor G247 , Checking .

Deviation fuel rail pressure control -0.01 g
And Deviation lambda control >30%

Fuel cut off, Not active
Engine speed, 640-3480 rpm

Time after engine start, >250 sec.
High pressure pump set point, 0.005-0.05 g

Lambda control, Closed loop
EVAP canister load, 25%

5 Seconds

Continuous
2 DCY

P12A4

Fuel Rail Pump Control Valve Stuck Closed

Check the Low Fuel Pressure Sensor G410. Refer to → Low Fuel Pressure Sensor G410 , Checking .

Deviation fuel rail pressure control -0.025 g
And Deviation lambda control -1010%

Fuel cut off, Not active
Engine speed, 640-3480 rpm

Time after engine start, >250 sec.
High pressure pump set point, 0.005-0.05 g

Lambda control, Closed loop
EVAP canister load, 25%

5 Seconds

Continuous
2 DCY

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.