What are the condition of the plastic lenses on your remote & doors? If they are badly scratched/oxidized the range and effectiveness will be greatly reduced. A bit of 3M plastic polish made a big difference with mine.

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"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles