"The 'LH' stands for German: "Luftmasse-Hitzdraht"" -- https://en.wikipedia.org/wiki/Jetronic
The 510 is not specific to the heated oxygen sensor. It is the one that will work in place of 503. IPD circulated the rumor that LH2.1 exists more widely than it does. Both 83 and 84 non-turbo use LH2.0 which then was called LH-II. The EFI 84 turbo used in a 7-series has adopted the LH2.1 spot before LH2.2 came out for the 240 in '85. Dave -- blame IPD for the disinformation.
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Art Benstein near Baltimore
"...real expertise is never appreciated. People would always rather muddle along in their own dim, blundering way than have someone else point out where they were going wrong--even if that other person is clearly brighter." -Jeff Lindsay
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