u/AnyDurian6177

So a weird thing is happening:

Yesterday when I was touring, the route is approx 125kms (Norifumi db off). Check engine light came on.

Went to sc to get it cleared since there were no visible error warnings, it was about 02 sensor.

And when I was returning the engine check light came on again. (Is still on will take to sc on monday again.)

Idk the actual reason, Is it happening due to me driving at higher speeds without db or is it something else? I've attached how the rear 02 sensor is fitted with a welded bung same as other owners.

What might be the issue? I planned to get fuelx anyways, is it due to that?

I've also use rrp and decat on stock muffler, never faced this.