GMC Sierra 2015 Peace be upon you O2 sensor spacer, a replacement for the catalytic converter. A spacer that fits onto the O2 sensor. It improves the sensor's reading as if the converter is present. In case of damage, removal, or modification of the catalytic converter, the Check Engine light will turn on. If the Check Engine light appears, check with a computer and confirm the error code you have: P0420,P0421,P0422,P0423,P0424 P0430,P0431,P0432,P0433,P0434 And due to the Check Engine light appearing, these problems occur: 1- Very high fuel consumption 2- Delayed starting 3- Weak acceleration 4- Shaking, sputtering, and muffling 5- Remote start fails 6- Traction control fails 7- 4WD fails The spacer improves the sensor's reading so that the Check Engine light turns off and these problems are resolved. The price for the straight one is 70 SAR. And the price for the "L" shape is 110 SAR.