STP 16oz Exhaust and Emissions System Cleaner Fuel Additive

I had a "service engine soon" light and a P0420 code (oxygen sensor issue); I installed a new sensor and turned off the error code but it returned. I decided then to try this product as a last resort as my registration was due in a couple of days, and fortunately my car passed the smog check without a problem.

[This review was collected as part of a promotion.] The cleaner made my car run better and it’s very reliable. It was easy to apply and the instructions were easy. Now I car runs very smoothly and don’t have problems with it. You can’t even hear my car turn on. That’s how good it it’s

[This review was collected as part of a promotion.] The STP exhaust emission system cleaner worked really well at helping my vehicle run smoother and improving overall engine performance. After using it in a full tank of gas, I noticed reduced hesitation during acceleration and a smoother idle within a few days. It's easy to use, just pour it into the gas tank and it gave me a peace of mind knowing it helps clean the emissions system and reduce buildup that can affect efficiency over time.

[This review was collected as part of a promotion.] I was very surprised at how easy this was to use! I just poured it it in to the fuel tank of my Toyota and Voila my engine was running so much smoother! My check engine light was on and turned off! Which was awesome! I will purchase this in the future!

[This review was collected as part of a promotion.] I received the STP Fuel, Exhaust & Emissions System Cleaner from Influenster and it was really simple to use—just pour it into your gas tank before filling up. I like that it helps clean the fuel system and remove buildup while supporting overall engine performance. It’s an easy way to add a little extra care to your car during a normal fill-up. Overall, I highly recommend this fuel exhaust and emissions system cleaner.

[This review was collected as part of a promotion.] After having my car parked 2 years and not using it, this product came in handy to help it pass the smog check. I’d had taken my car prior to using this product and the inspector told me the car wasn’t passing the smog test so I tried this product and took my car afterwards and it passed! Highly recommend!

[This review was collected as part of a promotion.] Although the check engine light didnt go off in my husbands work car it started running a lot better. It definitely cleaned the fuel and exhaust system well! You add it to a full tank which is what we did. My husband can see a difference in the performance of the car!

[This review was collected as part of a promotion.] This is good stuff. My car seems to be running a lot better it it is so easy to use. All you do is dump it in your gas tank right before or right after you fill your car up. It says it can help turn off your engine, light and pass emission test also removed carbon and buildup. and it cleans out your fuel system. If you got a check engine light on and ain’t got the money to get it off I’d say give it a try.

[This review was collected as part of a promotion.] My husband drives an older car and it had been horrible on gas! I decided to add stp fuel exhaust and admission system cleaner to his car! We were getting ready to take a trip and his car is a little bigger so we took his! Well I can honestly say his car was so much better on gas this trip! We usually have to stop 3 times before we get to our destination! We stopped twice and he still had a half a tank when we got there!

[This review was collected as part of a promotion.] I got this 16oz exhaust emission system cleaner for free from STP and Influenster in exchange for my honest review. I don’t see any immediate changes, but it was very easy to use! I used it as instructed before my inspection and it passed with flying colors! It helps clean out all the gunk that gets trapped. Again, hard to see any immediate changes but I feel it was helpful and I’d use it again in future!