0258007057 17014 Wideband AFR Upstream Oxygen Sensor 1 LSU-4.2 5 Wires for Audi TT A4 1.8L A8 Quattro 4.2L, Touareg 4.2L Passat 1.8L Eurovan 2.5 2.8 Beetle 2.0 1.9 Golf 0258007090

It fits perfectly great product. Solved my efi issue

This was a good value. Car parts store wanted $108. It works as it should

Bosch style sensors are plentiful. These are cheap Chinese knock-off sensors. All 3 that I bought failed within 30 minutes of use. The car runs great now that I put an OEM sensor in. If these are not knock offs they are definitely factory reject production, returns or seconds quality. Of course I bought them in the fall, and tried to use them in the summer when I actually drive the car. Please don't bother, you are wasting your money.

I bought this to replace the O2 sensor in the FiTECH Go 600 EFI and it works great. This one has a much linger cable than the the one that comes with the kit and allows better routing away from hot exhaust and other items that could chafe the wires.Would recommend.

I like product for the cheap price and that it actually works

Wrong connector end so I had cut and splice in the old one and solder the wires

It was the prefect fit for my Harley-Davidson wide band O2 sensor for the turner I have. Little bit of effort on removing the exhaust but fast replacement.

The Bosch units have been trouble prone in the past. Been told the 4.9 is way better and will be changing to it just as soon as feasible. The Bosch units of the 4.2 seem to fail prematurely often in a matter of a month or few. Which is unacceptable, especially when you depend on them for auto self tuning as with Megasquirt and other aftermarket ECUs which depend on accurate and timely readings. Otherwise risking engine damage. Definitely purchase the product protection with how expensive these are. You will likely go through many. If anyone has found a reliable brand other than the Bosch units please put info in a write up. I was surprised tomsee some bad reviews of the Bosch 4.9 also. I hope they are unfounded.