CarFix Answers

2011–2017 Ford Explorer: Exhaust or rotten-egg smell inside the cabin

Likely causes, ranked

  1. Gaps in rear body seams/liftgate letting exhaust in (sealing per Ford TSB 16-0166)$0–$0Shop
  2. Damaged rear air extractors or missing liftgate drain valvesShop
  3. Climate control recirculation logic (module reprogram)$0–$0Shop
  4. Unsealed holes from police/fleet equipment installsShop

Real-owner fix counts will appear here as reports come in.

DIY or shop: See DIY or shop section

Parts to check

As an Amazon Associate I earn from qualifying purchases.

These are search links; confirm fitment for your exact engine and trim. Affiliate disclosure

AD SLOT 1 (placeholder)

Symptom: You smell exhaust or sulfur inside the car, especially when accelerating hard with the A/C on recirculate. Some owners report headaches.

Likely causes

  1. Body sealing. Ford's bulletin has the dealer pressure-test and seal the rear seams and liftgate.
  2. Rear extractors and drain valves that are damaged or missing.
  3. Climate control settings. The bulletin includes a climate control module reprogram.
  4. Police and fleet installs that left holes unsealed. Explorer Forum covered Ford's free repair offer for about 1.4 million Explorers.

Cost

Ford did these repairs for free under its program. Ask a dealer about your VIN.

DIY or shop?

Dealer. The one DIY step is buying a carbon monoxide detector.

Useful steps

  1. Put a carbon monoxide detector in the cabin right away.
  2. Ask the dealer to perform TSB 16-0166, or to check whether it was already done.
  3. Drive with fresh air instead of recirculate until it's fixed.

Vehicle focus: 2011–2017 Ford Explorer.

Safety / mechanic note

Carbon monoxide can make you sick or kill you with no warning. If you smell exhaust or feel dizzy, open the windows and pull over. Verify with a mechanic and use a CO detector.

AD SLOT 2 (placeholder)

Recalls & service bulletins

Technical service bulletins

  • 16-0166 2016-12-15 2011–2017 Explorer exhaust odor in vehicle: inspect/seal rear seams, replace drain valves and damaged extractors, reprogram climate control. Details

NHTSA complaints: 1,490 keyword-matched complaints for Ford Explorer 2011–2017 (of 11,914 total complaints queried, NHTSA complaints API by model year, queried 2026-10-15).

Always check your VIN for open recalls at nhtsa.gov/recalls.

Sources

What actually fixed it?

Had this problem? Tell other owners what the real fix was. Reports are counted above; we never show made-up numbers.

AD SLOT 3 (placeholder)