The P1324 and P1340 codes
indicate a problem with the timing chain being out of position on Bank 2 and Bank 1, respectively. This is a serious issue that requires immediate attention as it affects the engine's ability to coordinate valve and piston movement. Possible causes
- Worn or broken timing chain guides: Plastic guides can wear down, break into pieces, and cause the timing chain to become loose.
- Weak or failing timing chain tensioner: Tensioners keep the timing chain tight, and their failure can lead to a loose or stretched chain.
- Stretched timing chain: Over time, the timing chain can stretch due to wear, long oil change intervals, or stressing the engine (e.g., revving before the oil circulates).
- Worn sprockets: The sprockets the timing chain runs on can also wear down.
- Faulty variocam actuator: In Porsche engines, these codes can be linked to a defective variocam actuator, which controls camshaft timing.
- Camshaft or crankshaft sensor issues: While less likely to be the primary cause for both banks being out of position simultaneously, problems with these sensors or their wiring can cause incorrect timing readings.
Common symptoms
- Rattling or clattering noises from the engine, especially at idle or low speeds.
- Engine misfires.
- Illuminated check engine light.
- Engine performance problems, such as rough running or reduced power.
- Metal shavings in the engine oil.
Repair cost
Timing chain replacement is an expensive repair, with costs typically ranging from $1,600 to $2,700, including both parts and labor. Labor alone can account for $1,300 to $1,900 of this cost. In some cases, the timing chain tensioner may also need to be replaced, adding another $1,000 or more to the repair cost.
Important considerations
- It is crucial to stop driving the vehicle immediately if these codes appear, as a timing chain failure can cause catastrophic engine damage (e.g., bent valves, damaged pistons).
- A proper diagnosis by a qualified mechanic using appropriate tools is necessary to determine the exact cause of the issue.
- When replacing timing chain components, it is recommended to replace all related parts, including guides, tensioners, and sprockets, to ensure long-term reliability.
