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I have a DMM with long leads to be able to monitor the O2 sensor output.
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you can catch the 02 sensor sig wire right under the passengers floor mat..
The test here is to pull the vac hose off the fuel reg and watch for high[rich] o2 voltage, then pull a vac line and watch for lean condition. You are using the engine as a test platform for the sensor by manually changings the a/f mix and seeing if the 02 responds...unplug the sensor at the connector under the mat when doing this so the ecu can not correct/override your manual inputs..
Are you sure they changed the boots/resistors under each coil .. very important !!
..also, did you get a code from pin 14 , if UK even has that.......................
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