I have replace oxygen sensors, wire, spark plug g-power NGK ALL 6, valve stem seals, powersteeing belt, alternatur belt, timingbelt and my check engine light is still on i have taking it to the shop that are saying i have a missfire on 2 4 6. what can be wrong and how much more money am out. its a 95 lexus es 300 134500 mil.
I had same problem ... combo of electrical quirk and o2 regulator...as soon as it comes back on return to shop have the reset and drive the alloted miles mine took four maybe five resets different codes showed up some were dups.(don't do repairs) (except O2 if needed for inspection etc, I actually had stickers put on car inbetween.light on and off ...season changed (?) and it stayed off short maybe(?) also have Lexus 1995 ES 300 98000 miles.
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The way to stop the check engine light is to pull the error code(s) from the computer and resolve what is indicated. REMEMBER the code is a CLUE and not necessarily the issue, for example, an intake leak can cause a oxygen sensor to register out of range.... The light would reset automatically, in absence of errors.
#1 stay away from Ottozoo. #2 have a good repair shop check it out. Most likely the A/F ratio sensor (oxygen sensor) is bad. the BLACK wire is power for the heater, so if the BLACK wire has power, replace the A/F ratio sensor.
Yes the airflow meter is very easy, it is in the air intake hose to the engine from the air cleaner. Boy those Japanese car makers really take you to the cleaners on repairs, that repair on a GM car would have been 1/2 that amount.
a common problem is the vacuum switching valves on the charcoal canister. These are small electrical solenoids with 2 vacuum hoses going to them. When you put power and ground to them they should click. Otherwise make sure there isn't a vacuum hose disconnected by the air cleaner box.
chances are you don't have to replace the computer. the reason i tell you this is because you did not mention that the car is running lousy. no complaints of rough idle or missfire or hard starting. chances are that your engine speed sensor which sends the signal to the computer which then controls the transmission is most likely the culprit.. and it could just bhe that there is a loose connection between the two. if that is ok then your transmission control module is faulty. this is not the main computer, but the gobetween the trans and the ecm.. hope this helps please rate this...thanks(btw....the knock sensors control timing not the trans mission)