What should I do if my ho2s sensor is not working?
What should I do if my ho2s sensor is not working? Check the manufacturer’s specifications, as there may be a chart informing you of what the voltage should be at a given RPM. If it fails this test, replace the MAF sensor and retest. If all tests have passed so far, and you continue to get a P1131 code, monitor the HO2S. Where to find the ho2s switch on a Ford? Typically, it will be found close to, if not directly screwed into the exhaust manifold that cylinder 1 exhaust gases flow out of. Once located, visually inspect the connectors...