Musty Odor After Rain in 2020 Toyota RAV4
A musty smell after rain typically indicates moisture accumulation in the cabin, often from clogged AC drain tubes, wet cabin air filter, or water intrusion due to blocked sunroof drains or door seals.
Diagnosis Details
Possible Causes
Clogged AC evaporator drain tube causing water to pool and grow mold/mildew
Wet or contaminated cabin air filter (often from rain ingress or high humidity)
Blocked sunroof drain tubes or leaking door/window seals allowing water into carpet or insulation
Related OBD-II Codes
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What You Should Do
Inspect and clean the AC evaporator drain tube (often under the dashboard or near firewall).
Replace the cabin air filter if damp or dirty.
Check sunroof drains for blockages and verify door/window seals are intact.
Dry any wet carpet or insulation thoroughly to prevent mold growth.
Related Repairs
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.