# O2 Sensor/ Check Engine Light On then Off **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, malibu\ **Created:** [October 23, 2017, 10:18pm UTC](https://community.cartalk.com/t/o2-sensor-check-engine-light-on-then-off/108859 "2017-10-23T22:18:02Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Adison](https://avatars.discourse-cdn.com/v4/letter/a/a9a28c/32.png) [@Adison](https://community.cartalk.com/u/Adison)\ **Post date:** [October 23, 2017, 10:18pm UTC](https://community.cartalk.com/t/o2-sensor-check-engine-light-on-then-off/108859/1 "2017-10-23T22:18:02Z")
My 2014 Chevy Malibu has its check engine light come on and when I plugged a code reader in it it said bad O2 sensor but the next day the check engine light was off and when I plugged the code reader in it it said nothing… any help? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [October 23, 2017, 10:22pm UTC](https://community.cartalk.com/t/o2-sensor-check-engine-light-on-then-off/108859/2 "2017-10-23T22:22:16Z")
The OBDII system turns the Check Engine light on when there’s an issue with the emission control system. If the problem no longer exists, the OBDII system turns the Check Engine light off. More than likely the problem is with a lazy O2 sensor. Tester ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [October 24, 2017, 12:14am UTC](https://community.cartalk.com/t/o2-sensor-check-engine-light-on-then-off/108859/3 "2017-10-24T00:14:22Z")
Suggest to post the actual diagnostic code number. There’s no diagnostic code for a bad O2 sensor. The codes are for O2 sensors that produce unusual readings, or open circuits in the case of heated sensors, either of which may or may not be caused by the O2 sensor ass’y itself. If you’ve got an O2 sensor problem remaining, the check engine light will come back on again. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [October 24, 2017, 12:17am UTC](https://community.cartalk.com/t/o2-sensor-check-engine-light-on-then-off/108859/4 "2017-10-24T00:17:11Z")
[https://www.obd-codes.com/p0133](https://www.obd-codes.com/p0133) Tester ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [October 24, 2017, 1:36am UTC](https://community.cartalk.com/t/o2-sensor-check-engine-light-on-then-off/108859/5 "2017-10-24T01:36:51Z")
> [@Tester](#): > > More than likely the problem is with a lazy O2 sensor. Generally that means it’s on its way “out”. ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [October 25, 2017, 12:26am UTC](https://community.cartalk.com/t/o2-sensor-check-engine-light-on-then-off/108859/6 "2017-10-25T00:26:41Z")
Aren’t oxygen sensors covered under 7/70 or 8/80 in some states . . . ? ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [October 25, 2017, 12:27am UTC](https://community.cartalk.com/t/o2-sensor-check-engine-light-on-then-off/108859/7 "2017-10-25T00:27:40Z")
Not that I’m aware of. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [October 25, 2017, 1:07am UTC](https://community.cartalk.com/t/o2-sensor-check-engine-light-on-then-off/108859/8 "2017-10-25T01:07:47Z")
Since 1996 (OBDII), the emission components covered under the mandated EPA warranty regulations for 8 years/80,000 miles are the catalytic converter(s)/emission control computers. All other emission control components are warranted for 2 years/24,000 miles. But any mechanic should know this. Tester ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [October 25, 2017, 2:24am UTC](https://community.cartalk.com/t/o2-sensor-check-engine-light-on-then-off/108859/9 "2017-10-25T02:24:21Z")
There is a long list of emissions covered components covered for 7 years/70,000 miles in the state of California but oxygen sensors are not on the list. PZEV vehicles have a complicated emissions warranty that differs by state. Light trucks over 8500# are covered for 5 years/50,000 miles. Warranty requirements have changed so much since 1996 it is best to check warranty coverage for each case. ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [October 25, 2017, 4:34am UTC](https://community.cartalk.com/t/o2-sensor-check-engine-light-on-then-off/108859/10 "2017-10-25T04:34:06Z")
> [@the\_same\_mountainbike](#): > > Not that I’m aware of. Thank you for the answer > [@Nevada\_545](#): > > There is a long list of emissions covered components covered for 7 years/70,000 miles in the state of California but oxygen sensors are not on the list. That was helpful, and respectfully worded Thank you 😃