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      02-24-2010, 02:35 PM   #11
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Drives: Lemans Blue M3
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Originally Posted by Kyoshi71 View Post
Ohms need to match

This is a must...

The resistance of the wire extension needs to match the original OE 02 sensor wires, in order to ensure a proper signal feedback from the sensors to the ECU.

The 02 sensors work off very sensitive differential voltage values (to calculate the oxygen content in your exhaust gas stream), so a very high, or very low resistance wire will skew the signal feedback results.

When that happens, the ECU will detect an issue (and throw a fault code)...when there is actually nothing wrong.

A poorly executed solder joint (between the OE O2 sensor wire and the new wire extension) will also be problematic.

You will end up chasing a 'phantom' 02 sensor fault code that doesn't exist.
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