Auto Dynasty's 90-Degree O2 Oxygen Spacer Adapter spaces out the O2 sensor, the result is that O2 Sensor is removed from the direct flow of gas of exhaust system and perform "Check Engine Light" fix. Even though O2 sensor may still read some exhaust gas; however ECU could make judgment that restriction (such as catalytic converter) in exhaust gas exists. Auto Dynasty's O2 Sensor Spacer is known for minimizing the chance of CEL caused by an O2 sensor. 

Note: 

1. No guarantee that this product works on all applications 

2. ECU may need to be reset if CEL is triggered before hand