My CA car has the 16-hole diagnostic socket that has a push button below #1 and a red LED light below #3.

I am getting codes: 28,29,34 all relating to a "coolant temperature" reading issue.

I have three senders at the top of my head: a black one closest to the fire wall, a single post sender more forward, and a two-post sender even more forward still.

Which sender and associated wiring do I need to address to clear the codes?

Thanks,

AL

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03 CLK430 Cabrio 211K Pweter Silver/ Oyster Leather
90 300SEL 214k Pearl Black/ Alto Grey/Black Leather

Prior: 85 190E, 88 300TE, 89 300TE, 90 300E 2.6, 90 300TE, 92 300E 2.6, 91 and 93 300SL, 87 Ferrari Mondial Cabrio