A scanner on Howo, Shacman, Sitrak and Weichai shows SAE codes (P0087, P0335, U0155), sometimes SPN/FMI and Chinese internal numbers. ChinaDiag takes all of those formats: type it as on the screen or take a photo — OCR pulls the codes.
What the lookup means
The service is not just the line “low fuel pressure”. For each code: a live description, 4–6 causes by frequency, check steps, OEM only from the database, and whether you can limp to a shop. The database has thousands of cards for Howo, Shacman, Sitrak and Weichai.
How to enter a code
On the home page pick model and engine, on step 2 paste the code or upload a screen photo. Three checks free. If the code is rare and there is no card — the model says data is thin and will not invent a part number.