My records show that P1796 Fault indicates a Kick Down Switch Circuit Malfunction, however there appears to be some discrepency here as other records show it as a CAN bus (off) fault. A quick check to see if your car will go into kickdown should identify which is which. Clear the fault then drive gently for 20-30 miles, if no engine light then use the kickdown and see if it comes on. You can check out other fault codes at http://www.bluejag.co.uk.
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