You can check codes easily, without a scanner. With the engine off, turn the key on, off, on, off, on, off, on. (On = run, not start)
Your digital odometer display should display 2-digit codes, ending with "55". They should also blink out on the check engine light.
Alternatively, most part stores will read your codes for free.
He that would make his own liberty secure, must guard even his enemy from oppression; for if he violates this duty, he establishes a precedent that will reach to himself. --Thomas Paine
We work together every damn day. --Jon Stewart
Any gas can be a knockout gas, when you wrap a steel cylinder around it and beat someone with it.
Low Output 4 Cylinder Jeep Club member #188