A P0299 fault on a 2009–2012 Audi A4, A5 or Q5 does not prove that every part of the turbocharger has failed. For vehicles with the CAEB engine, Audi bulletin 2031245 describes a specific failure pattern: excessive wear in the wastegate linkage creates play at the wastegate flap, boost escapes, and the control unit stores P0299. Before buying a turbo, confirm the engine code, verify physical wastegate play, and rule out other sources of underboost.

Which Audi vehicles the bulletin covers

Audi's Technical Service Bulletin 2031245/5, dated June 7, 2013, lists these US-market applications:

• 2009–2012 Audi A4 with the CAEB engine
• 2009–2012 Audi A5 with the CAEB engine
• 2009–2012 Audi A5 Cabriolet with the CAEB engine
• 2009–2012 Audi Q5 with the CAEB engine

The engine code is essential. Model year, body style and “2.0T” badging are not enough because similar vehicles can use different engine and emissions configurations. Check the vehicle-data label, service information and VIN-linked catalog data. The VIN decoder can help establish the vehicle identity, but the actual engine code and build data should be confirmed before ordering.

The bulletin's fifth revision specifically removed model-year 2013 vehicles and the A6 from its coverage. Those vehicles should not be added to this repair path simply because they also store P0299.

What P0299 means—and what it does not

P0299 indicates that measured boost is lower than the engine controller expects under the conditions in which the fault is monitored. It describes the result, not the failed component. A charge-air leak, disconnected hose, control-valve problem, sensor issue, damaged wiring, exhaust restriction or another mechanical fault can also prevent the engine from reaching requested boost.

Audi's bulletin applies when both of its stated conditions are present:

1. The malfunction indicator lamp is on and P0299, described in the bulletin as negative pressure deviation, is stored.
2. The turbocharger wastegate flap has play.

That second condition separates this bulletin from a code-only diagnosis. A scan report showing P0299 is useful evidence, but it is not a substitute for inspecting the wastegate mechanism and the rest of the boost system.

How wastegate play causes underboost

The wastegate controls how much exhaust gas bypasses the turbine. Its linkage must move the flap while allowing it to close correctly. Audi explains that, under certain driving conditions, the actuation linkage can wear excessively. The resulting looseness lets boost escape through the wastegate flap, so actual boost falls below the requested value and P0299 is stored.

A light rattle at the turbo area is not, by itself, the complete bulletin diagnosis. The technician should confirm that the play is at the wastegate flap and that it is responsible for the pressure deviation. Before condemning the turbocharger, the intake and charge-air path should also be checked for loose connections, split hoses and other leaks.

Audi's repair direction matters to buyers

For the exact bulletin condition, Audi's 2013 procedure calls for removing the turbocharger, installing a specified spring clip on a replacement turbocharger's linkage joint, and then installing the replacement assembly. It also warns not to install that clip on a used or already damaged turbocharger because the same improvement is not achieved.

That instruction should shape a buyer's expectations. A loose-wastegate unit is not made equivalent to the bulletin repair merely by adding a clip. If a shop is following Audi's procedure for confirmed linkage wear, ask which replacement strategy it intends to use and whether all required hardware and sealing parts are included.

A used turbocharger can still be evaluated as a replacement part for other repair circumstances, but Audi did not endorse fitting the bulletin clip to a used unit. Any used assembly should be checked independently for wastegate wear, shaft condition, housing damage and correct fitment. The distinction between “compatible used turbo” and “Audi bulletin repair” should remain clear.

Replacement turbo fitment checklist

Start with the Audi turbocharger catalog, then verify the physical and electronic details against the original unit. A model-year range alone is too broad.

• Record the complete VIN and confirm the CAEB engine code.
• Confirm the body style: A4, A5 Coupe, A5 Cabriolet or Q5.
• Record the Audi part number and every suffix on the original turbocharger.
• Ask whether the number has been superseded and what applications the replacement number covers.
• Compare turbine and compressor housings, exhaust flange, oil and coolant connections, and mounting points.
• Compare the wastegate actuator, linkage orientation and electrical or vacuum connections.
• Inspect the wastegate joint for looseness rather than relying on an exterior photograph.
• Check the compressor inlet and outlet for impact damage, oil pooling and foreign-object marks.
• Inspect shaft movement and wheel condition using the rebuilder's or service manual's limits; do not invent a universal “acceptable play” value.
• Confirm which gaskets, studs, nuts, seals and clips are included.
• Keep installation debris out of the oil, coolant, intake and exhaust passages.
• Confirm the return conditions before installation and retain photos of the received assembly.

Audi's bulletin listed turbocharger part number 06H 145 702 S and clip 06J 145 220 B at the time of publication. It also states that parts and service references can change or be removed. Treat those numbers as historical bulletin references, not as automatic proof of current interchange.

Used, remanufactured or new turbo?

The right choice depends on the confirmed failure and how the replacement was evaluated.

A used turbocharger preserves an original production assembly and may suit a repair when its application and condition are verified. The seller should be able to identify the donor application and provide clear views of the housings, ports, actuator and wastegate linkage. For this Audi wastegate-wear issue, a buyer should be especially cautious of a unit with unknown linkage condition.

A remanufactured turbocharger should be judged by the documented process, not the label alone. Ask which rotating, bearing, sealing, actuator and wastegate components were inspected or renewed and how the completed assembly was checked. “Rebuilt” and “remanufactured” are not standardized descriptions across every seller.

A new service replacement is the option contemplated by Audi's bulletin procedure. Even then, part-number supersession, included hardware and vehicle fitment still need confirmation. New does not eliminate the need to match the exact application.

Questions buyers often ask

Does P0299 always mean the turbocharger must be replaced?

No. P0299 reports underboost. Audi's bulletin requires both the code and wastegate-flap play for this specific repair path. Other leaks, controls, sensors and mechanical conditions can also cause underboost.

Can I install Audi's clip on my existing worn turbo?

That is not what bulletin 2031245/5 instructs. Audi says the clip is installed on a replacement turbocharger and specifically warns against installing it on a used or pre-damaged turbocharger.

Does this bulletin include a 2013 Audi A4 or Q5?

No. Revision 5 removed model-year 2013 vehicles. Use current service information for a 2013 vehicle rather than extending this bulletin beyond its stated coverage.

Is the bulletin a recall or proof of current warranty coverage?

No. It is a technical service bulletin, not a safety recall. The document says it is informational when the vehicle is outside applicable warranty. Current coverage must be determined for the individual vehicle.

What should I send with a parts request?

Include the VIN, exact engine code, original turbocharger number with suffix, body style, photographs of the ports and linkage, and the diagnostic findings. Mention whether P0299 and physical wastegate play were both confirmed. A detailed parts quote request reduces the risk of receiving a visually similar but incorrect unit.

Bottom line

For a 2009–2012 Audi A4, A5, A5 Cabriolet or Q5 with the CAEB engine, P0299 plus verified wastegate-flap play matches the condition in Audi bulletin 2031245/5. The code alone does not. Confirm the engine code, inspect the boost system and wastegate mechanism, and follow the correct repair strategy before ordering. When a turbocharger is justified, compare the complete part number, actuator and linkage, housings, ports and included hardware—not just the model year and “2.0T” description.