2003 Toyota Sienna Q&A
2003 Toyota Sienna Question: oxygen sensor
First of all, what is the code number? The code doesnt usually say the oxygen sensor is bad, but it will specify, bank one or bank two, up stream or down stream, and if it is a heater circuit code, lean code, rich code, ect....... you could have something as simple as a vacumm leak or possibly a cracked exhaust manifold. But start with the code number and let me know. - JASON LEWIS
replaced speed sensor & 2 oxygen sensors. codes wont clear & car is still not running right
One or more oxygen sensors may fail resulting in illumination of the Check Engine Light.
How do I replace or fix my Oxygen Sensor ???