My 2009 Camry check engine light is on. Dealer said the two O2 sensor both are dead and need to replace. After dealer reset the check engine light I have driven two days for 50 miles and the check engine light doesn't come back. If the O2 sensor is bad how long does it take for check engine light on again? Is it possible the check engine report on by mistake since two O2 sensors got bad at the exact same time is really rare. Thanks for help!
Jimm 2/16/2013The oxygen (O2) sensors are usually replaced in pairs - due to mileage, age / wear considerations. The O2 sensors operate in tandem, that is when one goes bad or fails; usually the upstream sensor, then the second sensor (usually the downstream sensor) fails as well - because of the exhaust gases and operating conditions.
Check the many different on-line auto parts sources; such as - www.autopartswarehouse.com, www.partsgeek.com and www.rockauto.com for the replacement parts. For example, they (RockAuto) list the oxygen sensor from around $35.00 each for your vehicle.
The oxygen sensors are not difficult to replace - check the 'How-To-Guides' feature on the AutoMD website for the specific steps.
Walker Pro 5/7/2013Good afternoon David,
Since I do not have the mileage on your vehicle or any information on the codes that were generated, I can only give you information based on what I know.
It may take several cold starts & drives before the Check Engine Light comes on again, but rest assured it will. Your vehicle is equipped with an Air Fuel Ratio Sensor upstream of the catalytic converter and a standard switching sensor downstream. Air Fuel Ratio Sensors are notorious for causing intermittent check engine lights when they are starting to fail. The dealer was correct in suggesting you replace both sensors when a code is set for one of them. Otherwise it is likely you will have another check engine light instance soon after the first sensor is replaced.
The correct sensors for your vehicle that Walker Products can provide are as follows:
Front A/F sensor is Walker part number 250-54007
Rear O2 Sensor is Walker part number 250-24360
Please let us know if we can of any more help.
-Walker Tech (www.walkerproducts.com)