Howo most often comes in with rail, crankshaft-sensor and CAN codes. A7 runs WD615 and WP10, T7H runs WP13 and MC11/MC13. ChinaDiag matches the code to the service database and gives a check order, not “replace everything”.
WD615 and WP10
WD615 (Euro-2/3 and common-rail) is sensitive to pump feed, filters and the pressure sensor. WP10 on Howo is the usual rail, metering-valve and CKP-at-flywheel story. If the scanner shows P0087, P0335, U0155 or internal Weichai codes — type them on the home page or send a screen photo.
How to use it
Pick Howo and the engine, set the year, type a code or send a scanner photo. You get a description, likely causes, check steps, and whether you can keep driving. OEM only if the number is in the database.