Yesterday a loose cat lower heat shield was ripped from my 04 Odyssey while driving taking the downstream o2 sensor wiring with it. Immediately the Check Engine, Supplemental Restraint System, Traction Control and door ajar lights all went on. The drive indicator began to blink and the transmission mostly disengaged. It would still drive but it was as if it was slipping severely. The next day I replaced the o2 sensor but the symptoms remained. After a short test drive I discovered that the gauges and odometer were intermittent. After a stop and attempt to restart I discovered the alternator had stopped charging. Volt meter shows about 10v at the battery terminals while running after a jump with voltage steadily falling. Checked the wiring downstream of the o2 sensor connector and it looks unharmed. All fuses ok. Attempted to reset the ECU according to some online instructions (which I'm suspicious of). Any help or insight would be much appreciated. Pretty Desperate in KY

 

Sounds like it knocked a ground loose too. Check all wiring that is anywhere near the underside again, especially up around the alt and that area. Can you read any codes?

 

Thanks, took a look under and could find nothing but will continue looking. Will put a code reader on tomorrow.