Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › ’04 Honda Element – code p0721 after engine swap › ’04 Honda Element – code p0721 after engine swap
October 15, 2019 at 10:36 pm
#895097
what actually fixed mine was: there are two identical sensors on the the back side (between the trans and the firewall/ attached to the trans) that have the same identical connection. I had those two connections swapped and didn’t know it. i swapped the two and it fixed everything.
hope this helps.