Ff24 occurred battery replacement solutions

[JanusXJS (Patricia Cole)]

Replaced dead battery and shortly thereafter check engine code ff24 appeared. What solutions are available to resolve this problem.

[JimD_in_Alabama (JimD in Alabama, 95 V12 XJS Coupe, Marelli, LHD)]

Welcome Patricia. Your info indicates 1994 convertible but no indication of which engine. Folks on here will need that piece of info

[sbobev (Steve)]

FF24 is a code specific to the ignition amp for the AJ6 engine. Quick digging through the archives:

[xj-s] Check engine light code ff24

In reply to a message from mjbeemanmb sent Mon 26 Jul 2004: I assume that you have the 6 cyl engine ? (the V12 was a rare beast only in the XJR-S in’93 I think) I have the same car, and the 5 vol Factory shop manual. As you said, its Ignition-related. P18.1-8 lists ff24 as ‘Ignition drive’ Function: ‘Looks for ECU output to ignition amplifier module’ There - isn’t that clear now !! In pracice, I’ve had several of these over the years, usually related to low battery voltage when I start …

[JanusXJS (Patricia Cole)]

First thank you for responding to my concerns. After requesting assistance I realized that the check engine code was FF44 and not FF24. Information such as battery replacement detailing the check engine code on my 1994 XJS convertible by is correct.

[sbobev (Steve)]

FF44 is oxygen sensor fault

[JanusXJS (Patricia Cole)]

She is 6 cylinder 2+2. Thank you for advising me to be more specific.