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Good news guys I just found out that we can use the apexi safcII to display oxygen sensor voltages. Only for the 5sfe through that I know of.... See the safc has 2 inputs for air flow. For the 5sfe we will only be using one (the white wire from the safc) which leaves the blue wire unused. If you connect the blue wire from the safc to the oxygen sensor wire then you will be able to read oxygen sensor voltage. To display o2 sensor voltage go to the sensor check screen and look at the In-2. Optimum is 0.5v. More lean is closer to 0.2v and more rich is closer to 0.9v. This can be used to double check and make sure you are not running lean under boost. If you are boosting and your voltage drops past 0.4v then you may require more tuning...... Just my 2 cents.........................:thumbup: ;)

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isn't there a way to test it with a multimeter in the diagnostic box under the bonnet? I'm pretty sure there is

if someone knows, can they let me know?
 
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