STP 1 Tank Tune Up Fuel Additive Fuel System Cleaner and Exhaust System Cleaner, Cleans Fuel Injectors, Intake Valves, Cylinder Head and Piston Tops, 12 Fl Oz

Wow my check engine is gone i recomend this

Received the item today. I drove about 300 miles roundtrip and it increased mpg amd engine seems to run smoother. I dont know if it cleaned the oxygen sensors and spark plugs though because it's not time for smog check and not time for maintenance which is about a year away.

It does work well, but it still takes more than 1 tank unless it’s just rolling over to 5,000

My vehicle didn’t have a codes or any lights on the dash on, but I had noticed that it was idling rough and seemed to hesitate on quick acceleration. I gave this a try and it seems to have worked everything out and my cars runs great. I’d say you’ll get your moneys worth and it’s pretty simple to use.

Everything is going smoothly so far. My vehicle had some minor issues with acceleration, but no error codes were present, and there was no check engine light. This product appeared to have effectively resolved the problem. Time will confirm whether the acceleration issue returns.

Easy to use. Cranks easier now. I added 2 bottles at once, shock and awe. It actually works great.

My truck is 18 years old and doesn’t get driven much due to having a company car. The truck has 110,000 miles and the check engine light has been on so I scanned it and it said the spark plugs were worn and I needed a new 02 sensor. After changing the plugs, coil packs, wires and 02 sensor it still didn’t run right and the check engine light still came on. I took it to a repair shop and they charged me well over $500 to change out the intake manifold gasket. After all of this, I drove it from Louisville to Nashville and it still didn’t feel right and the check engine light and the service stabilitrack light came on 3 times on the way down. Each time I would pull over and scan it to see what code it was throwing and each time it said the same thing. Before leaving Nashville, i stopped and purchased the STP one tank tune up additive and filled up my tank with Mid-Grade fuel. My truck instantly ran better and no check engine light came on for the whole 3.5 hour trip. Used the scan tool again when I got home and for the first time in 2 years it gave me a green check mark which means everything is good with the system. I’m usually skeptical about any additives doing what they say but this stuff delivered as stated. I’m beyond impressed and will be running this stuff through the fuel system every 4 months going forward.

Used two bottles back to back but made no difference. Don't waste your money