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Check code 25

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
CHECK CODE 25 DIAGNOSTIC PROCEDURES

Check code 25 Water temperature gauge operation signal
INSPECTION CONDITION DISPLAY ACTION
After selecting check code 25, wait approx. 2s. oo The water temperature gauge indicates status in the following order approx. every
  • H --> Center --> C --> H (fixed)
The water temperature gauge is normal.
Except above Replace the instrument cluster.
Err Replace the instrument cluster.