after changin o2 sensors why is the engine light co.ing bach on with code for o2
Asked by sapphire8282 Nov 04, 2015 at 08:36 PM about the 2003 Subaru Baja
Question type: Maintenance & Repair
3 Answers
These codes are saying that there is something wrong with the heater control circuit that warms up the O2 sensor. Either there is a problem with the wiring, connection, or in the O2 sensor itself. The O2 sensor cannot be fixed, only replacement is required.
TheSubaruGuruBoston answered 8 years ago
The O2 sensor heaters' grounds are switched by the ECU. so check those big connectors under the passenger side carpeting too.
