I recently had a serious engine problem which caused the "check engine" light to go on and the engine can now not even be started.

I checked the ODB dtc / fault codes in 2 ways:

  1. An undocumented "test mode" in the dash display showed "dtcs none"
  2. I bought a bluetooth odb reader off Amazon and it also showed "no codes".

The reader I bought did display some data and it also reacted when cranking the car. So I assume that it was working properly.

My car is a 2010 Diesel Nissan Qashqai, so I assume, that the reader should be compatible.

Is it worth it trying to read the code with a better reader and if yes, what type of reader would be better? Or is it common, that seemingly major problems, which trigger the check engine light, don't actually record a code?

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