Hi people,
I had the same problem for more than 3 months on my Mazda 6 2.2D 175hp (2016) 210k on the clock. In the beginning, the warning appeared to stay for some days and disappear, but in the last month it did not disappear and the engine started to rattle. I checked everything on the internet and on the forums. The owner's manual says that might be possible problems with the following:
- A malfunction in the battery management system.
- A malfunction in the brake switch.
- (SKYACTIV-D 2.2)
- A malfunction in the engine's hydraulic control.
- A malfunction in the engine's timing chain.
- A malfunction in the blow-by heater.
- A malfunction in the oil level sensor.
For my annual oil, filter and brake pads change I asked my mechanic to check the vacuum pump and make full diagnostics on the car. It turns out that I have two errors P1336 and U0442.
P1336 is for a faulty crankshaft position sensor and U0442 is something related to the electronics. Which led us to a problem crankshaft position sensor or stretched timing chain. But since there was rattling in the engine I asked to check the timing chain as well. The problem was in the water pump and chain tensioner were faulty.
Now two weeks later everything seems to be normal and no more vehicle system malfunction warning light
Hope this helps,
Cheers
