Took to shop & changed EGR valve but it came back on. Had friend code it & got P1133, P0401 & P0171. How can I fix?
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1999 Toyota RAV4 Question: My check engine light went on & will not turn off.
Answer #1ProfessorG from G. T. Service Center, October 12, 2013, 15:10Master
An EGR valve is used to enrich the fuel mixture, by introducing exhaust gas back into the intake. The LEAN code shows you're not getting enough fuel for a proper mixture. Possible causes are Vacuum leak, Fuel filter restriction, weak Fuel Pump, o2 sensor, or maybe a Mass Air Flow sensor. Run fuel data on scan tool for short term fuel,o2 sensor data. Maybe need to take it to a repair facility who knows what to look for. This same problem happens quite often on most vehicles.
Answer #2galada2d October 20, 2013, 17:50Rookie
sad to say, but i had this problem with my 2008. had oil change, new filter. all fluids checked. just regular routine maintanence . my light went out. didn't run diagnostics. not sure if this is your problem, but read my manual it states your engine light will come on when oil change, fluids checked is due.