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Originally Posted by 997_986
This is all the more interesting given that oxygen sensors rely on reference air, which they receive via the supply wires. Therefore, the supply wires must not be soldered. At least, that is my understanding. I used to be a huge fan of soldering, but with the right tools, you can achieve excellent results with crimping. When measuring the resistance afterwards you can rule out a bad connection.
But I don’t want to hijack the thread either ;-)
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Sorry, but that is not correct. O2 sensors function by measuring very slight changes in resistance due to the level of oxygen in the exhaust gases which alters the voltage signal (which is typically less than 1 volt), which the DME sees as a signal to adjust the fueling level. Crimp connectors can easily alter the base resistance in the wiring harness and the corresponding voltage, and if not heat shrink sealed can allow moisture into the connection, again altering the base system resistance, or even shorting the wire, altering the signal the DME sees. Soldering and heat shrinking eliminates these problems permanently.
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Last edited by JFP in PA; 07-28-2026 at 05:51 AM.
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