It is not the speed sensor at issue then, it is the wiring, try replacing the connector to the speed sensor, a common fault. Solder and shrink tube the repair connector to the harness. The dealer can supply a new connector, about $20.00
SOURCE: 2001 Accord coupe Codes P0505 - P0700 - 40-01. Any
those are manufactor specific codes and if u go to an offical honda site these year accords have serious known transmission problems that are still covered by the dealer even though out of warranty
SOURCE: 88 Prelude
You need to check the tcm for codes too. The s3 light is like the check engine light for the tcm. The VSS code might be your problem.
SOURCE: Speedometer stuck at 20 miles an hour?
My 96 did the same thing. The speed sensor is and was fine -- the problem is an open circuit in the wires inside the gauge itself.
The Chilton's manual has pretty good instructions on how to replace the instrument cluster. You can buy just the speedometer gauge, or an entire instrument cluster for $100 or so on eBay. Just be sure you get a cluster that matches your model and trim line -- the LX and DX have different clusters, and of course the automatic and the 5-speed are different as well.
Do be sure to disconnect the battery before you begin the project, as there's a (slim) chance you can discharge the airbags if you don't
SOURCE: 2001 Honda - New Catalytics & O2 sensors -- new 0420/1739/1456
I would send the car for a smoke test for the emissions leak...Find out where the leak is comming from..Repair it..Reset the codes, then do a drive cycle and see what happens...
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