P0345 on 2005-2008 Audi A4 3.2L V6: Cam Sensor Fault vs. Timing Chain Failure

What's Unique About the 2005-2008 Audi A4

The B7 generation A4 with the BKH 3.2L V6 engine has its timing chains located at the rear of the engine, against the firewall. This engine family is well-documented for having issues with plastic timing chain guides and hydraulic tensioners failing. Therefore, a P0345 code is not just a simple sensor fault; it can be the first and most urgent warning of a stretched timing chain or failing tensioner. Ignoring this code, especially if accompanied by a startup rattle, can lead to catastrophic engine failure.

Symptoms You May Notice

• Check Engine Light is on
• Engine is difficult to start or cranks for a long time
• Engine stalls, especially at low RPM or idle
• Rough idle and engine vibration
• Noticeable loss of power and poor acceleration
• Engine misfires, potentially with codes for multiple cylinders on Bank 2 (e.g., P0300, P0304, P0306)
• Reduced fuel efficiency

Most Likely Causes

1. Failed Camshaft Position Sensor (Bank 2 Intake) 🔴 High Probability → Shop Engine Camshaft Position Sensor Heat and vibration in the engine bay can cause these electronic sensors to fail over time. Oil leaks from the valve cover gasket can also contaminate the sensor and its connector.
   How to confirm: Swap the Bank 2 (driver's side) intake camshaft sensor with the Bank 1 (passenger's side) intake sensor. Clear the codes and run the engine. If the code changes to P0340 (Camshaft Position Sensor 'A' Circuit Malfunction Bank 1), the sensor is faulty.
   Typical fix: Replace the Bank 2 intake camshaft position sensor.
   Est. part cost: $40-$120
2. Failing Timing Chain Tensioners or Stretched Chain 🟡 Medium Probability → Shop Engine Timing Chain The 3.2L FSI V6 is known for premature failure of its plastic timing chain guides and hydraulic tensioners. The rear-mounted position of the timing system makes this a very labor-intensive repair.
   How to confirm: Listen for a distinct metallic rattle from the back of the engine for 1-3 seconds on a cold start. 🎬 Watch: Hear what a failing timing chain sounds like at startup. Use a diagnostic tool (like VCDS) to check Measuring Value Block 093 for camshaft phase adaptation. Values for Bank 2 exceeding -8° are a strong indicator of a timing system problem. Some forum users report driving with values over -10° but this is not advised.
   Typical fix: This is a major repair requiring engine removal to replace all timing chains, tensioners, and guides. This should be performed by a qualified specialist. The job can cost between $4,000 and $6,000 at an independent shop.
   Est. part cost: $800-$1500 for a full kit
3. Damaged Wiring or Connector ⚪ Low Probability Engine bay heat can make wiring insulation brittle and connectors fragile over time. The harness can be damaged during other repairs if not handled carefully.
   How to confirm: Visually inspect the wiring harness and connector for the Bank 2 intake cam sensor. Check for chafing, breaks, or corrosion on the pins. Use a multimeter to test for continuity and proper voltage at the connector (typically a 5V reference, ground, and signal wire).
   Typical fix: Repair the damaged section of the wiring harness or replace the sensor pigtail connector.
   Est. part cost: $15-$50
4. Faulty Camshaft Adjustment Solenoid (VVT) ⚪ Low Probability → Shop Engine Camshaft These solenoids can become clogged with oil sludge or fine metal particles, causing them to stick and not adjust cam timing correctly.
   How to confirm: Swap the Bank 2 intake solenoid with the Bank 2 exhaust solenoid. Clear codes and see if the fault code changes (e.g., to a P0346 or similar). You can also remove the solenoid (held by one T25/T30 Torx bolt) and inspect its screen for debris. 🎬 Watch: How to test and clean a stuck camshaft adjuster solenoid. Test it with a 12V source to see if it actuates (clicks).
   Typical fix: Remove and clean the solenoid screen. If cleaning doesn't work, replace the Bank 2 intake camshaft adjustment solenoid.
   Est. part cost: $50-$150

Rare But Worth Checking

• Failing Engine Control Module (ECM): This is very rare. The ECM should only be considered after all other possibilities, including sensors, wiring, and mechanical timing, have been exhaustively ruled out.

Diagnosis Steps

1. Read the code with an OBD-II scanner to confirm P0345 is present.
2. CRITICAL STEP: On a cold engine, start the vehicle and listen carefully for any rattling or chain-slap noise from the rear of the engine near the firewall. Any rattle indicates a probable timing chain issue and you should stop and seek professional diagnosis.
3. If there is no rattle, proceed. Visually inspect the wiring and connector for the Bank 2 (driver's side) intake camshaft position sensor. It is located on the top front of the valve cover. 🎬 See this walkthrough on how to access and replace the sensor. Look for any signs of damage, corrosion, or loose connections.
4. As a simple test, swap the Bank 2 intake sensor with the identical Bank 1 (passenger side) intake sensor. Clear the codes, start the engine, and see if the fault code returns as P0340. If it does, the sensor you moved is bad.
5. If the code remains P0345, consider the camshaft adjustment solenoid. Swap the Bank 2 intake solenoid with the Bank 2 exhaust solenoid. If the code changes, the solenoid is faulty. You can also remove it (one Torx bolt) and clean the mesh screen.
6. If the code remains P0345 after the sensor and solenoid swaps, the problem is likely in the wiring or the mechanical timing.
7. Use a multimeter to check the sensor connector for a 5V reference signal, a good ground, and a fluctuating signal wire with the engine cranking.
8. If wiring and sensors are confirmed good, the next step is to check for mechanical timing issues. This requires an advanced scan tool (like VCDS) to read camshaft phase adaptation values in measuring block 093. A value for Bank 2 greater than -8° (e.g., -9°, -10°) strongly indicates a stretched chain or bad tensioner, which is a job for a professional.
9. If all else fails, consider a faulty ECM, though this is extremely unlikely.

Parts You'll Likely Need

• Camshaft Position Sensor (Bank 2 Intake) (OEM #06E905163) — This is the most common direct cause of the code when there are no underlying mechanical issues.
  Trusted brands: Bosch, Vemo, NGK, OE Supplier
  OEM price range: $80-$120
  Aftermarket price range: $40-$75
• Timing Chain Kit — Required if diagnosis points to stretched chains or failed tensioners, a known issue on the BKH engine. This is a major, high-labor repair.
  Trusted brands: Iwis (OEM supplier), FCP Euro Kit, INA, ECS Tuning Kit
  OEM price range: $1000-$1500 (for parts kit)
  Aftermarket price range: $700-$1000 (for parts kit)
• Camshaft Adjustment Solenoid (OEM #06E109257P) — A less common but possible cause. The solenoid can get stuck due to debris, preventing proper cam phasing and triggering a sensor performance code.
  Trusted brands: Audi Genuine, INA
  OEM price range: $120-$160
  Aftermarket price range: $70-$100

Related Codes That Often Appear With This One

• P0340 — This is the equivalent code for Bank 1. It may appear if sensors are swapped for diagnosis or if there are widespread timing issues.
• P0300, P0304, P0305, P0306 — These are random and cylinder-specific misfire codes. If the cam timing on Bank 2 is incorrect, it will cause misfires on the cylinders of that bank (4, 5, and 6).
• P0018 — Crankshaft Position - Camshaft Position Correlation Bank 2 Sensor 'A'. This code specifically indicates that the timing between the crank and the Bank 2 intake cam is out of sync, pointing more strongly toward a mechanical timing issue.

Platform-Specific Known Issues

• The BKH 3.2L V6 engine is widely known for premature failure of its upper timing chain tensioners and plastic guides. This code is a primary symptom. The repair is extremely labor-intensive as the timing system is at the rear of the engine, requiring engine or transmission removal for access. Repair costs can exceed the value of the vehicle.
• A user on YouTube documented a P0346 (Bank 2 exhaust sensor) fault that presented with identical symptoms. After replacing the tensioner with no success, the root cause was found to be a camshaft adjustment solenoid that was stuck due to a small metal particle. This highlights the importance of diagnosing the solenoids before condemning the timing chains.

Mechanic-Grade Diagnostic Values

• Camshaft Position Sensor (G163) Connector Voltage — expected: 5V between the outer pins with key on, engine off.. Failure: No voltage or significantly less than 5V suggests a wiring or ECM power supply issue.
• Camshaft Adjustment Solenoid (N208) Internal Resistance — expected: 5.0 to 8.0 Ohms at approximately 20°C (68°F).. Failure: A reading outside this range, or an open/short circuit, indicates a faulty solenoid.
• Wiring Harness Continuity to ECM — expected: Maximum resistance of 1.5 Ohms between a sensor connector pin and the corresponding ECM pin.. Failure: Resistance higher than 1.5 Ohms indicates a break or high resistance in the harness.

Hidden / Shadow Codes Worth Checking

• 16729/P0345: Camshaft Position Sensor (G163): Malfunction. This is the VAG-specific (Ross-Tech) identifier for the generic P0345 code, pointing to the Bank 2 sensor. (see via VCDS (VAG-COM) or other diagnostic tools that read manufacturer-specific codes.)
• P0346 - Implausible Signal: This is a range/performance code for the same sensor. In some cases, it can appear alongside P0345 or instead of it, often pointing to intermittent signal loss or mechanical timing issues rather than a complete circuit failure. (see via Standard OBD-II scanner or VCDS. A forum post showed this code appearing with a P0304 misfire.)

Scan Tool Commands That Help

• VCDS (VAG-COM): Engine-01 -> Measuring Blocks-08 -> Group 093 — This is the most critical diagnostic step after checking the sensor itself. The values in fields 2 (Bank 1) and 4 (Bank 2) show the camshaft phase adaptation in degrees. A value for Bank 2 that is more negative than -8° (e.g., -9°, -10°) is a strong sign of a stretched timing chain or failing tensioner.
• VCDS (VAG-COM): Engine-01 -> Output Tests-03 — This function can be used to cycle the camshaft adjustment solenoids (N205, N208, etc.). You should hear an audible click from the solenoid as it actuates. A lack of a click can indicate a stuck or failed solenoid, which is a much cheaper fix than a timing chain job.

Wiring & Ground Locations

• Camshaft Position Sensor (G163) Connector — On the top front of the driver's side (Bank 2) valve cover.. This is the primary connection point for the sensor. Pin 1 is power (5V), Pin 3 is ground. Testing voltage here is the first step in diagnosing the electrical circuit.
• G12 Ground Point — Located at the center of the firewall in the engine bay.. This ground point serves the ECM. A loose or corroded connection here can cause a variety of erratic engine management faults, including sensor codes.
• Engine Block Ground Strap — A small ground wire often attached to a bolt on the oil filter housing.. This is a critical ground point for engine sensors. Forum users report it can be easily missed or left loose after service, causing hard-to-diagnose electrical issues.

Real Owner Repair Stories

• Ross-Tech Forum User (2008 Audi A6 3.2L BKH Engine) — MIL on, misfire in Cylinder 4 (P0304), and Camshaft Position Sensor Implausible Signal (P0346).
  ❌ Tried (didn't work) Replacing valve cover gaskets, Replacing all spark plugs and coil packs, Replacing the Bank 2 Camshaft Position Sensor (G163)
  ✅ What actually fixed it A dealership found and cleaned out dirt that was clogging the Bank 2 Cam Adjuster Valve (solenoid). This resolved the misfire and related codes without requiring a timing chain replacement.

OEM Part Supersession History

• 06E109257F → 06E109257J, then 06E109257P — Revisions to improve reliability and prevent sticking/clogging issues.
  Heads up: The latest part number, 06E109257P, is the recommended replacement for all previous versions.
• 06E905163 → No direct supersession found, but multiple manufacturers produce this part. There is a note for some models that this part is for vehicles built up to 05/15/2006, suggesting a possible change, but it appears to fit the entire 2005-2008 range for the A4 3.2L.

Model Year Variations Within This Range

• 2004-2010: The BKH engine is part of a larger EA837 family that includes AUK, BPK, and BYU codes. While mechanically very similar, there can be minor differences in ECU software. A Ross-Tech forum thread indicates that VCDS may identify a BKH engine as AUK because they use the same label file, confirming they are functionally almost identical for diagnostic purposes.

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 — Extremely common on all FSI (direct injection) engines. Typically requires cleaning every 60,000-80,000 miles. Causes misfires, rough idle, and loss of power.
• Front Control Arm Bushing Failure 🟠 Medium — The multi-link front suspension has numerous rubber bushings that wear out, causing clunking noises over bumps, poor handling, and uneven tire wear. Usually requires replacement around 80,000-100,000 miles.
• PCV Valve Failure 🟠 Medium — The Positive Crankcase Ventilation (PCV) valve can fail, leading to high oil consumption, rough idle, and potential damage to engine seals. It's a common failure point on many VAG engines of this era.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used Camshaft Position Sensor or Camshaft Adjustment Solenoid from a low-mileage donor vehicle can be a cost-effective option, as they are plug-and-play components. However, given the relatively low cost of new aftermarket parts, buying new is often preferable.

Donor-vehicle mileage cap: roughly under 75000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• For sensors/solenoids, check the connector for corrosion or damage.
• Ask for the donor vehicle's VIN to verify mileage and check for accident history.
• Avoid parts from engines that show signs of heavy oil sludge or poor maintenance.
• NEVER buy used timing chain components (chains, tensioners, guides).

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

• Timing Chain Components: Due to the high failure rate and extreme labor cost of the job, only use OEM (Iwis) or high-quality, reputable aftermarket kits. This is not a job you want to do twice.

Aftermarket brands forum-validated for this vehicle:

• Sensors: Bosch, NGK, OE Supplier
• Solenoids: INA (often an OE supplier), Genuine Audi
• Timing Chain Kits: Iwis, FCP Euro Kit, ECS Tuning Kit, Vaico

Brands owners have reported issues with on this vehicle:

• Unnamed or 'white-box' electronic sensors and timing chain kits from online marketplaces. The risk of premature failure is too high for the labor involved.

Real Owner Stories

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

Related OBD-II Codes

• P0340 — The Bank 1 equivalent of P0345; often appears if the faulty Bank 2 sensor is swapped to the passenger side for testing.
• P0346 — Corresponds to the Bank 2 exhaust camshaft sensor; often triggered by the same timing chain stretch or solenoid debris issues affecting the BKH engine.
• P0300 — Random or multiple cylinder misfire code that frequently accompanies P0345 when timing is retarded or sensors fail.
• P0304 — Cylinder 4 misfire; specifically related to Bank 2 (driver's side) where P0345 originates.
• P0306 — Cylinder 6 misfire; another Bank 2 cylinder often affected by camshaft timing malfunctions on this V6 engine.

Frequently Asked Questions