Audi OBD2 codes

P0087 from fuel vapour in the rail in extreme heat

Supported by vehicle data

Audi bulletin 01137220332111 says that on some 2013 models, including the A4, A5, A6, allroad and Q5, long idling or stop-and-go driving in extreme heat can vaporise fuel in the rail and set P0087 briefly. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P0087: Fuel pressure in the rail or supply system is lower than the engine computer requested

P0088 with an engine that will not start

Supported by vehicle data

Audi bulletin 24-09-08 covers a no-start on some 2007 to 2009 petrol models, including the Q7, where rail pressure too low or too high and low-side regulation codes such as P0088 may be logged. On 2009 to 2010 TDI models the code notes point to contaminated or wrong fuel instead. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P0088: Fuel rail pressure higher than the engine computer wants

P0234 as a software false alarm on some Audi models

Supported by vehicle data

Audi bulletin A011330 says P0234 on the 2009 to 2012 A4, A5 and Q5 can be set by the software alone when no other codes are stored. It can also have a real cause, usually with loss of power and uneven running, so check for those symptoms first. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P0234: Turbocharger or supercharger boost pressure is higher than the engine computer requested

P0321 with poor starting and the engine speed sensor

Supported by vehicle data

Audi bulletin A0123032072326_1 covers an engine that starts poorly with the emission warning lamp on, engine speed sensor G28 and P0321. Our notes cover the 2023 to 2024 RS 3. We only read the NHTSA summary, not the full bulletin. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P0321: Engine speed sensor signal out of range or implausible

P0321 when the engine speed sensor spacer is not required

Supported by vehicle data

Audi bulletin TSB-28-09-05 is titled MIL on, engine speed sensor spacer not required, and names P0321 among other codes. The summary mentions multiple misfires and a MIL that may be on or flashing. It covers some 2004 to 2008 A4 and 2005 to 2008 A6 models. Only the NHTSA summary was read, not the full bulletin. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P0321: Engine speed sensor signal out of range or implausible

P0328 with a drive system malfunction message

Supported by vehicle data

Audi bulletin 2081342 provides information for a drive system malfunction message with knock sensor codes, including P0328, on V6 TFSI engines. Only the NHTSA summary was read, and it does not give the repair. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P0328: Knock sensor 1 signal too high (bank 1)

P0411 from a cracked or broken vacuum hose

Supported by vehicle data

Audi bulletin 260702 says P0411, along with misfire and other air system codes, may come from a cracked or broken vacuum hose on 2000 to 2002 A8 and 2001 to 2002 A6. Check the vacuum hoses before replacing the air pump or valves. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P0411: Secondary air injection flow not as expected

P0422 with the MIL on in the 2000 A6 and A8

Supported by vehicle data

Audi bulletin 0401 lists P0422 with the MIL on for the 2000 A6 and A8. Only the NHTSA summary was read, and it is the only detail we have. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P0422: Main catalytic converter not cleaning exhaust well enough

P0432 with the warning light on on some Audi models

Supported by vehicle data

Audi bulletin 0401 covers the malfunction indicator light on with catalyst efficiency codes including P0432 stored in DTC memory. Our notes cover some 2000 model year Audi cars. The summary does not give the repair. We only read the NHTSA summary, not the full bulletin. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P0432: Main catalytic converter efficiency below the computer's limit (Bank 2)

P0491 from carbon in the secondary air ports

Supported by vehicle data

Audi bulletin A011383 covers P0491 stored together on the 2009 to 2012 A4, A6, Q5 and Q7, with the MIL on. It says carbon can build up in the secondary air ports in the cylinder head and restrict flow, on cars over 15,000 miles. We only read the NHTSA summary. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P0491: Secondary air injection system is not moving enough air (bank 1)

P0491 on the 4.2 FSI

Supported by vehicle data

Audi has a repair authorization covering P0491 on the 4.2 FSI engine in some Audi models. The NHTSA summary gives no repair details. Only the NHTSA summary was read, not the bulletin itself. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P0491: Secondary air injection system is not moving enough air (bank 1)

P0706 from a reaction between the fluid and the transmission computer

Supported by vehicle data

Audi bulletin 2034863 covers a gearbox warning with P0706 on the 2012 to 2013 A6 within a VIN range, caused by a reaction between the transmission computer and the fluid. Audi requires a fluid flush before the transmission computer is replaced, so do not start by buying a new computer. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P0706: Transmission range sensor signal out of range or not plausible

P2015 from the changeover valve on 2.0 TFSI engines

Supported by vehicle data

Audi bulletin 2072273 covers P2015 with changeover valve N316 on 2.0 TFSI models, including the 2021 to 2024 A3. Check that valve first. The bulletin is published on NHTSA, but we have not confirmed it is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P2015: The sensor that reports the position of the intake manifold runner flaps on bank 1 is giving a reading that doesn't match where the flaps should be

P2015 from a sticking intake flap on the Audi A6

Supported by vehicle data

Audi bulletin 2030192 covers P2015 on the 2007 to 2010 A6, caused by an intake manifold flap that sticks because of a deformed oil seal. Check for a sticking flap linkage before replacing sensors. We only read the NHTSA summary, not the full bulletin. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P2015: The sensor that reports the position of the intake manifold runner flaps on bank 1 is giving a reading that doesn't match where the flaps should be

P2187 from an intake air leak

Supported by vehicle data

Audi bulletin 2015505-10 ties P2187 and a system too lean at idle to an intake air system leak, with a possible whistle or air-rushing noise. It also mentions oil leaks. It covers A3, A4 and TT models from 2005 to 2010, and we read only the NHTSA summary. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P2187: Engine computer sees a lean mixture on bank 1 at idle: too much air for the fuel being delivered

P2440 and P2442 from a combi valve or the vacuum solenoid

Supported by vehicle data

Audi bulletin A011519 says P2440 and P2442 on some 2011 to 2015 Audi models with secondary air injection come from either a combi valve on one bank or the vacuum solenoid that drives both. Which codes are stored, one bank or both, points to which part has failed. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P2440: Secondary air switching valve stuck open (bank 1)
• P2442: Secondary air switching valve stuck open (bank 2)

P2600 among coolant pump circuit codes on the A6

Supported by vehicle data

Audi bulletin A9723952070557_1 lists the coolant pump circuit code, written in a longer hex format, among codes that light the check engine lamp on the 2023 A6. The NHTSA summary does not give the repair, so check the coolant level and the pump wiring and connector first, and read all stored codes together. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P2600: Coolant pump control circuit open

P2711 with a lit gear display and shudder

Supported by vehicle data

Audi bulletin 2029069 covers a lit gear display in the cluster and a shudder on first acceleration from a stop, with a fault entry logged in the transmission computer including P2711, on some Audi models. We only have the NHTSA summary, not the bulletin itself. Note when the shudder happens, such as on the first pull away. We have not confirmed the bulletin is still current, so this is labelled vehicle data rather than confirmed by bulletin.

• P2711: Unexpected mechanical gear disengagement

P2753 with transmission malfunction messages on the A6

Supported by vehicle data

A 2012 Audi A6 owner complaint on NHTSA reports repeated transmission malfunction messages with P2753 and a coolant leak dripping onto the transmission wiring. The source is owner reports, not a bulletin or a confirmed repair.

• P2753: Transmission fluid cooler valve circuit is open

P2753 with a transmission cooler valve circuit open

Supported by vehicle data

A 2012 A7 owner complaint to NHTSA reports P2753 as an open circuit in the transmission fluid cooler valve. The coolant control valve for the transmission was replaced because coolant leaked into the solenoid. This is an owner report only and needs testing to confirm.

• P2753: Transmission fluid cooler valve circuit is open

P2753 with no hot air from the vents

Supported by vehicle data

A 2013 Audi A8 owner told NHTSA that P2753 came with no hot air from the vents, and that coolant leaked through the control valve into the wiring and connector and corroded it. This is one owner narrative. The source is owner reports, not a verified repair.

• P2753: Transmission fluid cooler valve circuit is open

P0087: Fuel pressure in the rail or supply system is lower than the engine computer requested

Severity: Inspect soon Full P0087 guide

• A5 2013 · Supported by vehicle data · 1 bulletin

P0088: Fuel rail pressure higher than the engine computer wants

Severity: Inspect soon Full P0088 guide

• Q7 2007–2010 · Supported by vehicle data · 2 bulletins

P0234: Turbocharger or supercharger boost pressure is higher than the engine computer requested

Severity: Inspect soon Full P0234 guide

• A4 2009–2012 · Supported by vehicle data · 1 bulletin

P0321: Engine speed sensor signal out of range or implausible

Severity: Inspect soon Full P0321 guide

• A4 2004–2008 · Supported by vehicle data · 2 bulletins
• A6 2005–2008 · Supported by vehicle data · 2 bulletins
• RS 3 2023–2024 · Supported by vehicle data · 1 bulletin

P0328: Knock sensor 1 signal too high (bank 1)

Severity: Monitor Full P0328 guide

• Q7 2020–2026 · Supported by vehicle data · 1 bulletin

P0411: Secondary air injection flow not as expected

Severity: Monitor Full P0411 guide

• All models 2000–2002 · Supported by vehicle data · 1 bulletin

P0422: Main catalytic converter not cleaning exhaust well enough

Severity: Monitor Full P0422 guide

• A6 2000 · Supported by vehicle data · 1 bulletin

P0432: Main catalytic converter efficiency below the computer's limit (Bank 2)

Severity: Severity not verified Full P0432 guide

• A6 2000 · Supported by vehicle data · 1 bulletin
• A8 2000 · Supported by vehicle data · 1 bulletin

P0491: Secondary air injection system is not moving enough air (bank 1)

Severity: Severity not verified Full P0491 guide

• A4 2009–2012 · Supported by vehicle data · 2 bulletins
• A6 2009–2012 · Supported by vehicle data · 2 bulletins
• A8 2011–2012 · Supported by vehicle data · 1 bulletin
• Q5 2009–2012 · Supported by vehicle data · 2 bulletins

P0706: Transmission range sensor signal out of range or not plausible

Severity: Inspect soon Full P0706 guide

• A6 2012–2013 · Supported by vehicle data · 1 bulletin

P2015: The sensor that reports the position of the intake manifold runner flaps on bank 1 is giving a reading that doesn't match where the flaps should be

Severity: Monitor Full P2015 guide

• A3 2021–2024 · Supported by vehicle data · 1 bulletin
• A6 2007–2010 · Supported by vehicle data · 1 bulletin

P2187: Engine computer sees a lean mixture on bank 1 at idle: too much air for the fuel being delivered

Severity: Monitor Full P2187 guide

• A4 2005–2009 · Supported by vehicle data · 1 bulletin

P2440: Secondary air switching valve stuck open (bank 1)

Severity: Monitor Full P2440 guide

• All models 2011–2015 · Supported by vehicle data · 2 bulletins

P2442: Secondary air switching valve stuck open (bank 2)

Severity: Monitor Full P2442 guide

• All models 2011–2015 · Supported by vehicle data · 2 bulletins

P2600: Coolant pump control circuit open

Severity: Inspect soon Full P2600 guide

• A6 2023 · Supported by vehicle data · 1 bulletin

P2711: Unexpected mechanical gear disengagement

Severity: Inspect soon Full P2711 guide

• A3 2009–2010 · Supported by vehicle data · 1 bulletin
• TT 2009–2010 · Supported by vehicle data · 1 bulletin

P2753: Transmission fluid cooler valve circuit is open

Severity: Severity not verified Full P2753 guide

• A6 2012 · Supported by vehicle data
• A7 2012 · Supported by vehicle data
• A8 2013 · Supported by vehicle data