1994 Toyota Pickup 4 cyl Manual 225,00 miles
Check engine light on trouble code 27, replaced front o2 sensor, rear was replaced about 5 years ago, after replacing front sensor I now have 2 codes , 21 and 27; 21 = main oxygen sensor fault, 27 = sub- oxygen sensor signal or heater circuit fault. Would replacing rear sensor fix the problem ? or do I need to do something else....?
Check engine light on trouble code 27, replaced front o2 sensor, rear was replaced about 5 years ago, after replacing front sensor I now have 2 codes , 21 and 27; 21 = main oxygen sensor fault, 27 = sub- oxygen sensor signal or heater circuit fault. Would replacing rear sensor fix the problem ? or do I need to do something else....?
Sep 6, 2010 at 12:53 PM
