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PandaSPUR It's a known issue with the engines. You can just look up cam issues (P000A/B/C etc) on the forums. The final solution will be replacing the cam sprocket. They said the same thing to me about being "low on oil" but I'm pretty sure that was a bullshit excuse because I literally checked before bringing it in.
It's an annoying issue because it comes and goes. They have to "follow procedure" and troubleshoot the issue by going through a list of things first before finally replacing the cam sprocket. I had to badger them endlessly about it until I mentioned lemon lawing the car before they finally decided to just fix it. This issue has been reported numerous times already. If they're giving you a hard time I suggest contacting corporate to speed up the process.