After work intended to address water collecting in the trunk, repeat the original conditions in a safe place and check whether the symptom returns. Note rain, car-wash timing, and whether the spare-wheel well is wet. Record the result before clearing codes or resetting adaptations.
Follow the maker’s procedure for drive cycles and readiness monitors. Check seals and vents from visible areas; avoid sealing random gaps before locating the entry point. If the issue remains, return to the evidence instead of swapping another part.
Quick educational note
For information, not a diagnosis or repair instruction. Vehicle-specific checks are still required. Consult the manufacturer's guidance and a qualified technician.
How to use this information
This article explains general principles and does not establish what is wrong with your vehicle. Read the content limitations.