I also was having the flashing check light. I used the procedure in the manual to check the codes from the TOD. I was getting 14 and 24 which was the front and rear sensors. I didn't believe they could both be bad so I started tracing wires and found where the wiring was touching the exhaust pipe right next the TOD module. The wires were exposed, burnt, and shorting out which caused the problem. A relatively easy and free fix. The manual was a huge help!