Hi Everybody,
I am owner of a 2003 Lexus RX300 with 69000 miles and recently got an"Engine Check Light & VSC" came on. I went to "Advance Auto Parts" store and without absolutely no charge scanned the trouble code, which is P0136 - O2 Sensor Circuit Malfunction (Bank 1 Sensor 2).
I decided to figure out myself how to fix this kind of problem. I did a lot of googling, but I couldn't find any good pointed answer for this particular vehicle.
However, this is the only website where I found 100% information about RX300. By checking very carefuly "2003 RX300 Repair manual" 2003 RX300 Repair manual
I have found some steps to check the sensor:
1. Remove the driver's seat
2. Take out the floor carpet
3. Disconnect the oxygen sensor connector
4. Using an ohmmeter, measure the resistance between the terminals +B and HT
Resistance: 11-16 ohm
If the resistance is not as spacified, replace the sensor.
I'd checked the sensor and it is 15 ohm, so it means that the sensor is working propertly.
I also found some general information about 02 sensor:
"A code P0136 may mean that one or more of the following has happened:
Faulty O2 sensor leak in exhaust close to O2 sensor
Short to voltage on O2 signal circuit
Open in circuit resistance caused by corrosion in connector "
Please help me figure out what the problem is and if I need to replace this sensor even though it is working?
Thanks!
