VersaTune User Forum

mituc wrote: ↑October 27th, 2021, 10:10 pm You logged only 3-4 relevant parameters or so, but from how this looks it seems that your primary O2 sensor is not working.

mituc wrote: ↑October 28th, 2021, 9:13 am Load this preset (Dashboard -> Presets -> Import -> then load): https://www.dropbox.com/s/aoqz8qpw3bg9s ... vtpre?dl=0
On your d:)ashboard set the desired AFR and Actual AFR to AFR gas instead of lambda.

mituc wrote: ↑October 30th, 2021, 2:10 am Exactly. You need to replace it and fix that problem and then take it from there. At this point I'd say to use your car only with half throttle maximum, avoid boost. The fueling will follow the MAF calibration but without proper monitoring there is no way of knowing if you have other leaks on the intake side or not, and if you have vacuum leaks you could be running your car pretty lean and ruin the engine.

Belo1301 wrote: ↑October 30th, 2021, 2:25 am The worst part is if i didnt put versatune i would even know that my o2 isnt working and for how long its not working
no dtc i passed mot and everything

Belo1301 wrote: ↑October 30th, 2021, 2:25 am Is that the primary o2 before the car or after the cat?

mituc wrote: ↑October 30th, 2021, 4:38 am

Belo1301 wrote: ↑October 30th, 2021, 2:25 am The worst part is if i didnt put versatune i would even know that my o2 isnt working and for how long its not working
no dtc i passed mot and everything

Yep, it's not the first time this happens. These ECUs tend to give 0 full fucks about a lot of things: O2 sensors, spark plugs, oil pressure, and so on.

Belo1301 wrote: ↑October 30th, 2021, 2:25 am Is that the primary o2 before the car or after the cat?

The one before the cat, that one you can see after the turbo heat shield in the engine bay. So the more expensive one
You can get the OEM or an NGK/NTK equivalent. You may find parts that are listed as equivalents from other vendors, do NOT get anything else than the OEM or NGK/NTK.