P0016 on 2004-2012 Audi 4.2L FSI V8: Crank/Cam Correlation Causes and Fixes

What's Unique About the 2004-2012 Audi Multiple (A6, A8, Q7, S4, S5, RS4)

The defining characteristic of the Audi 4.2L FSI V8 in relation to this code is the location of its timing chains. Unlike most engines where the timing system is at the front, Audi placed the four timing chains on the rear of the engine, against the firewall. This design means the entire engine and transmission must be removed from the vehicle to perform any timing service. This is why a P0016 code, which might signal a less severe fix on other vehicles, becomes an extremely labor-intensive and expensive repair on these specific Audi models.

Generation note: This guide covers the 4.2L FSI (direct injection) V8 engine (Engine codes: BVJ, BAR, BNS, etc.) found in models like the A6 (C6), A8 (D3), Q7 (4L), S5 (B8), and RS4 (B7). The rear-mounted timing chain design and its associated problems are common across all these platforms.

Symptoms You May Notice

• Check Engine Light is on
• Rattling noise from the back of the engine on cold starts (often called the 'death rattle'). This sound typically lasts for 1-3 seconds before oil pressure builds.
• Rough idle or engine shudder, especially below 1700 RPM.
• Reduced engine power and acceleration.
• Engine misfires, which may trigger codes like P0300, P0301, etc.
• Engine stalling or difficulty starting.

Most Likely Causes

1. Worn or Broken Plastic Timing Chain Guides 🔴 High Probability → Shop Engine Timing Chain The original plastic timing chain guides become brittle over time due to heat cycles and age, eventually cracking and breaking apart. This is the most well-documented failure point on the 4.2L FSI engine, with pieces of the guide falling into the oil pan.
   How to confirm: A rattling noise on startup is a strong indicator. Confirmation requires using a scan tool (like VCDS) to check camshaft adaptation values in measuring block 093. Values exceeding -8° suggest significant timing deviation. Visual inspection requires engine removal.
   Typical fix: Complete timing service, which includes replacing all timing chains, tensioners, and guides. Upgraded guides are often made of a more durable material or are metal-backed.
   Est. part cost: $1500-$3000
2. Stretched Timing Chain(s) 🔴 High Probability → Shop Engine Timing Chain Over time and mileage (often cited after 80k-100k miles), the timing chains can stretch, causing the camshaft and crankshaft timing to become misaligned. This is exacerbated by failing tensioners.
   How to confirm: Diagnosed using a scan tool to check camshaft adaptation values (Phase Position) in Measuring Block 093. Values of -10° or more confirm a critical mechanical timing issue.
   Typical fix: Replacement of all four timing chains as part of a complete timing service.
   Est. part cost: $1500-$3000 (as part of a full kit)
3. Failed Timing Chain Tensioner(s) 🟡 Medium Probability → Shop Engine Timing Chain The hydraulic tensioners can fail to maintain proper oil pressure, especially on startup before oil circulates fully. This allows the chain to go slack and slap against the guides, accelerating wear and causing the startup rattle.
   How to confirm: A startup rattle is the primary symptom. The tensioners are inaccessible without engine removal and are always replaced during a full timing service.
   Typical fix: Replacement of all timing chain tensioners and associated seals.
   Est. part cost: $200-$500 (for tensioners alone)
4. Faulty Camshaft Adjuster Solenoid (N205) ⚪ Low Probability → Shop Engine Camshaft The solenoid that controls the variable valve timing (VVT) can become clogged with debris (especially from failing guides) or fail electronically.
   How to confirm: An Audi-specific TSB suggests swapping the solenoid with one from the other bank. If the fault code moves to the other bank (e.g., P0018), the solenoid is faulty. This should only be attempted if timing adaptation values are normal. Resistance can be tested and should be between 5.0 and 8.0 Ohms.
   Typical fix: Replace the faulty camshaft adjuster solenoid.
   Est. part cost: $100-$250

Rare But Worth Checking

• Low Oil Level or Pressure: While rarely the root cause on a high-mileage engine with this code, low or incorrect-spec oil (non-VW 502.00) can affect the hydraulic tensioners' ability to function, worsening a pre-existing mechanical issue. Always check oil level first.
• Failed Camshaft or Crankshaft Position Sensor: → Shop Engine Crankshaft Position Sensor While a sensor failure can theoretically cause this code, it is extremely unlikely to be the root cause on this specific engine. The problem is almost always mechanical timing. Do not replace sensors hoping for a fix without confirming the mechanical timing first.

Diagnosis Steps

1. Verify the oil level is correct and the oil is of the proper specification (full synthetic VW 502.00).
2. Use an Audi-specific scan tool (like VCDS by Ross-Tech) to read fault codes and check the camshaft adaptation values in Measuring Value Block 093.
3. Interpret the adaptation values: values between 0° and -6° are generally acceptable. Values between -7° and -9° indicate significant chain stretch or guide failure, and service should be planned. Values of -10° or more confirm a critical mechanical timing issue requiring immediate service.
4. Listen for a distinct rattling noise from the rear of the engine during a cold start. This is a classic symptom of guide failure and failing tensioners.
5. If camshaft adaptation values are normal (e.g., under -4°), you can test the Camshaft Adjuster Solenoid (N205) by swapping it with the one on the opposite bank to see if the fault follows. You can also test its internal resistance, which should be between 5.0 and 8.0 Ohms.
6. Do not replace the camshaft or crankshaft sensors unless they have failed a specific electrical test. On this platform, P0016 is overwhelmingly a mechanical fault.

Parts You'll Likely Need

• Timing Chain Kit (OEM #079109229KT2 (Example FCP Euro Kit)) — This is the definitive fix. A complete kit should include all four timing chains, all plastic guides (preferably updated versions), and all hydraulic tensioners to address the common failure points.
  Trusted brands: Audi Genuine, Iwis (OEM chain manufacturer), JHMotorsports (Performance/Upgraded kits)
  OEM price range: $2000-$3000
  Aftermarket price range: $1200-$2200
• Individual Timing Chains (OEM #079109229L, 079109229K, 079109229D) — These are the part numbers for the individual chains if not buying a complete kit. It is highly recommended to replace all of them at once.
  Trusted brands: Iwis, Audi Genuine
  OEM price range: $100-$300 per chain
  Aftermarket price range: $70-$200 per chain
• Camshaft Adjuster Solenoid (OEM #06E109257P) — A less common but possible cause. If diagnosis points to a faulty solenoid, it should be replaced.
  Trusted brands: Bosch, Audi Genuine
  OEM price range: $150-$250
  Aftermarket price range: $80-$150

Related Codes That Often Appear With This One

• P0017 — This code is for Bank 1, Sensor B (exhaust camshaft). If the timing is off, both intake and exhaust cams on the same bank may be flagged as out of sync.
• P0018 / P0019 — These are the equivalent correlation codes for Bank 2 (driver's side). It is common to see P0016 and P0018 together, which points to a failure of a central chain or guide affecting both banks.
• P0341 / P0346 — These are circuit/performance codes for the camshaft position sensors themselves. They can sometimes appear alongside correlation codes if the timing deviation is severe or if sensor wiring is damaged during engine failure.
• P0300, P0301-P0308 — Random or specific cylinder misfire codes are common secondary faults, as incorrect valve timing directly disrupts the combustion process in the affected cylinders.

Technical Service Bulletins (TSBs) & Recalls

• TSB 15-09-04 / 2020292/5: This TSB addresses camshaft adjustment issues. For P0016/P0018, it instructs technicians to check camshaft adaptation values. If the values are out of specification (e.g., beyond -8 degrees), it confirms a mechanical timing problem (stretched chains/failed guides) and authorizes the engine-out timing service. It also provides steps for testing the N205 solenoid if adaptation values are normal.

Platform-Specific Known Issues

• The primary issue is the rear placement of the timing system, which necessitates engine removal for service, dramatically increasing labor costs.
• The original plastic timing chain guides are known to become extremely brittle and fail, causing chain slack and the P0016 code. This is the most common point of failure.
• A startup rattle from the rear of the engine is the classic sign of failing guides and tensioners, and should be taken as a serious warning of impending failure.

Mechanic-Grade Diagnostic Values

• Camshaft Adaptation Phase Position (VCDS Measuring Block 093) — expected: 0° to -6° at warm idle.. Failure: Values of -7° to -9° indicate significant wear. Values of -10° or more confirm a critical mechanical timing fault requiring immediate service.
• Camshaft Adjuster Solenoid (N205) Internal Resistance — expected: 5.0 to 8.0 Ohms at approx. 20°C (68°F).. Failure: A reading outside this range indicates a faulty solenoid.
• Crankshaft Position Sensor (G28) and Camshaft Position Sensor (G40) Voltage Supply — expected: Approximately 5.0V reference signal from the ECU with key on, engine off.. Failure: No voltage or significantly lower voltage points to a wiring or ECU issue, not necessarily a bad sensor.

Scan Tool Commands That Help

• VCDS (Ross-Tech): Engine -> Measuring Value Blocks (MVB) -> Group 093 — This is the primary diagnostic step to quantify the degree of camshaft timing deviation. The 'Phase Position' values for Bank 1 and Bank 2 directly show how much the timing has stretched or slipped.
• VCDS (Ross-Tech): Engine -> Output Tests -> Camshaft Adjustment — This function allows you to command the N205 solenoid to actuate. You should hear an audible click from the valve. This helps determine if the solenoid is completely dead, though it doesn't rule out intermittent or partial failure.

Wiring & Ground Locations

• Engine Ground Strap — Typically located between the engine block and the chassis frame rail on the passenger side. There may be multiple grounds.. A poor engine ground can cause erratic signals from the crankshaft and camshaft position sensors, potentially leading to false correlation codes. While rare, it's a basic check before assuming major mechanical failure.
• ECU Connector — Located in the plenum chamber (under the plastic cover at the base of the windshield).. If sensor voltage tests at the sensor connector fail, the next step is to check for the same voltages at the corresponding pins on the ECU connector to determine if the fault is in the wiring harness itself.

Real Owner Repair Stories

• AudiWorld Forums user (2006-era Volkswagen Touareg with 4.2L FSI V8 (BAR/BVJ engine family), 120k miles) — P0016, multiple misfire codes (P0300, P0301-P0304), and engine clatter.
  ❌ Tried (didn't work) A mechanic confirmed fuel pressure was okay and suspected a failed timing guide, quoting a $6,000 engine-out repair.
  ✅ What actually fixed it The owner discovered the vehicle's battery was failing and providing low voltage. After replacing the battery, the P0016 code and all misfires were resolved and did not return after several thousand miles of driving.

OEM Part Supersession History

• 06E109257F, 06E109257J → 06E109257P — Internal design improvements to the solenoid valve to increase reliability and prevent sticking from oil sludge.
  Heads up: The newer part number 06E109257P is backward compatible with older versions.
• 079109469AC (for early 2004 models) → 079109469AD — As of mid-2020, Audi consolidated the part numbers. The early guide had a non-functional nub with an O-ring used for assembly line purposes, which was removed in the later design.
  Heads up: The newer part 079109469AD is the correct replacement for all years, including early 2004 models that originally used 079109469AC.

Model Year Variations Within This Range

• 2004-2006 vs 2007+: While the fundamental design flaw exists across all years, Audi made several revisions to the timing chain guides and tensioners in later model years (approx. 2007+). Later engines may have more durable guide material from the factory, but they are still considered a failure point, just potentially at higher mileages than the earliest B6/B7 S4 models.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Intake Valve Carbon Buildup 🔴 High — Considered an inevitable maintenance item on FSI (direct injection) engines. Significant buildup can occur every 40,000-60,000 miles, causing rough idle, misfires, and loss of power.
• Intake Manifold Runner Flap Failure 🟠 Medium — The plastic runner flaps inside the intake manifold can break or the actuating linkages can fail, typically after 80,000 miles. This causes fault codes (P2004, P2005, P2006, P2007) and can lead to a rough idle and loss of torque.
• Excessive Oil Consumption 🟠 Medium — Many 4.2L FSI engines consume oil, with Audi considering up to 1 quart per 1,200 miles as 'normal'. Causes can range from a failed PCV valve (crankcase vent valve) to worn piston rings on higher mileage examples.
• Starter Motor Failure 🔴 High — The starter motor is located in a difficult-to-access position. On some models like the S5, the official procedure requires engine and transmission removal, making replacement extremely labor-intensive and expensive ($3,000+ at a dealer).

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For this specific P0016 repair, using used parts is almost never a smart choice for the core timing components. The only scenario where 'used' is viable is when purchasing a complete, low-mileage, running 'donor' engine from a wrecked vehicle to replace the failed engine entirely. This can sometimes be more cost-effective than the 30-55 hours of labor for the timing job.

Donor-vehicle mileage cap: roughly under 70000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• Obtain a video of the donor engine running before it was pulled, specifically listening for startup rattle.
• Request VCDS scan results from the donor vehicle, paying close attention to Measuring Block 093 values. Anything greater than -6° should be avoided.
• Check the vehicle history (CarFax/AutoCheck) of the donor car for any signs of oil consumption issues or previous engine work.
• Visually inspect for major oil leaks, especially around the valve covers and rear timing covers.

OEM-only on this vehicle (don't cheap out):

• Timing Chains
• Timing Chain Tensioners
• Timing Chain Guides
• Camshaft Adjuster Solenoids (N205)

Aftermarket brands forum-validated for this vehicle:

• Iwis (Often the OEM supplier for the chains themselves)
• JHMotorsports (JHM) (Known for offering upgraded, more durable timing guide kits and mechanical adjuster repair kits)
• Febi Bilstein (A reputable German aftermarket supplier for some components)

Brands owners have reported issues with on this vehicle:

• Unnamed, no-brand 'complete' timing kits from online marketplaces (e.g., eBay, Amazon). These often use inferior quality chains and plastic guides that can fail prematurely, leading to a repeat of this catastrophic repair.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0018 — The Bank 2 equivalent of P0016; often used for diagnostic swapping of the N205 solenoid to see if the fault moves banks.
• P0300 — Random or multiple cylinder misfires that frequently occur when timing is misaligned due to failed guides or stretched chains.
• P0301 — Specific cylinder misfire code (Cylinder 1) that can be triggered by the mechanical timing deviation associated with P0016.

Frequently Asked Questions