Question about Volkswagen Beetle
If you have no communication to O2 sensor, then you need to test, and eventually replace O2 sensor wiring.
To test O2 sensor wiring you need to trace wiring to computer ECU/ECM , and use a multimeter set on Impedance to measure impedance between car computer contact and O2 sensor contact, after disconnecting O2 sensor. If the wiring is good you will read low Ohms, if not , you get discontinuity (infinite Ohms).
Posted on Sep 30, 2009
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Posted on Jan 02, 2017
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If you used an aftermarket O2 sensor, it may be the problem. 90% of the time, aftermarket O2 sensors dont have the strict specifications required for a specific vehicle due to them being made to fit a wide range of engines, and will reset the trouble codes because of this.
If all checks out, you may simply need new plugs and wires to ensure there is no misses or sputtering that those O2 sensors are picking up.
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