It was some time ago but I'm almost certain that when I read the codes on mine it flagged up that there was an issue with one of the rear sensors. Everything 'looked' OK but after a thorough clean the warning light remained so,after reading on here about issues with the module, I took the module apart and re-soldered it - it's been fine now for perhaps the last 5 years.
So the moral of this story is that a code reader may direct you to an area with a issue but not necessarily to the precise component with a problem - I assume that when I re-soldered the module it could then 'see' the perfectly OK sensor again and hence the warning light went out.
Hope this helps (and makes sense!)
John
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