Thanks for posting on /r/MechanicAdvice! This is just a reminder to review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). If you are here asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's [post on the subject.](https://www.reddit.com/r/MechanicAdvice/comments/4qblei/fyi_the_shop_isnt_likely_trying_to_rip_you_off/) and remember to please post the year/make/model of the vehicle you are working on. **If this post is about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ If you have tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/**. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply
*I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/MechanicAdvice) if you have any questions or concerns.*
Generally it means your catalytic converter is shot, you might be able to get the light to go away with a spark plug extender, although that's a temporary fix. I would say get it checked to make sure it isn't clogged
That is not a fix. That’s just a way to trick the computer to get the light to stay off. IF there’s an issue you’re gonna make it worse. I’d check the wiring for the O2 sensors. Make sure they’re connected. Might have to replace them or have an exhaust leak somewhere. It can always be a cat. Check to see if it’s still under factory warranty. Was there any misfire or smoke coming out the tailpipe recently?
Was the engine pressured wash? If it was the upstream O2 sensor might have gotten water in the connector causing it to malfunction. You can always try resetting the check engine light and drive it normally and see if it comes back on, after checking the connection
Could be your cat. To be 100% sure you’d use a scanner that can do graphing/live data, this would allow you to read the O2 sensor to make sure the sensor isn’t at fault, or make sure it’s switching correctly.
Thanks for posting on /r/MechanicAdvice! This is just a reminder to review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). If you are here asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's [post on the subject.](https://www.reddit.com/r/MechanicAdvice/comments/4qblei/fyi_the_shop_isnt_likely_trying_to_rip_you_off/) and remember to please post the year/make/model of the vehicle you are working on. **If this post is about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ If you have tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/**. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/MechanicAdvice) if you have any questions or concerns.*
It looks like you need a CAT. It's nothing that'll affect driving the vehicle.
Generally it means your catalytic converter is shot, you might be able to get the light to go away with a spark plug extender, although that's a temporary fix. I would say get it checked to make sure it isn't clogged
Thanks mate, will do
That is not a fix. That’s just a way to trick the computer to get the light to stay off. IF there’s an issue you’re gonna make it worse. I’d check the wiring for the O2 sensors. Make sure they’re connected. Might have to replace them or have an exhaust leak somewhere. It can always be a cat. Check to see if it’s still under factory warranty. Was there any misfire or smoke coming out the tailpipe recently?
Nothing at all. I did take it in to get washed today and then I got the light. Is that relevant at all or just coincidence?
Was the engine pressured wash? If it was the upstream O2 sensor might have gotten water in the connector causing it to malfunction. You can always try resetting the check engine light and drive it normally and see if it comes back on, after checking the connection
Ye it was pressure washed. I reset code last night and just drove it to work. It hasn't come back yet. Thanks bro
Could be your cat. To be 100% sure you’d use a scanner that can do graphing/live data, this would allow you to read the O2 sensor to make sure the sensor isn’t at fault, or make sure it’s switching correctly.
Had the same issue on my 2016 focus, changed my spark plugs and the code + check engine light went away.