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Even safer is use brake cleaner as a leak detector.
If the ECU says the 02 sensors is bad then its strategy is to operate open loop and the fuel delivery follows an internal map inside the ECU. Then it’s delivery follows the map schedule is based on rpm, mass flow, temp, and other available sensor inputs but it is no longer fine tuned by the 02 feedback, so the performance and economy will not be far off what the engine demands.
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