2004 Honda Element Q&A
2004 Honda Element Question: Key does not open rear door.
Could the second key be a valet key. Valet keys in other car manufacturers allow one key to lock and unlock everything and a second key will start the car and unlock the door but not open the glove box or trunk so you can lock your valuables in there. Did the second key open and operate all the locks in the past? Perhaps try putting some WD 40 in the locks and open and lock the locks with the "good" key then see if the second key now works. - patrick mannion