Please check fitment notes & description for accurate information. 1998-1999 Chevrolet Astro 4.3L 1998-1999 GMC Safari 4.3L Oxygen Sensor's Location: How do I know the O2 sensor is good or not? Check engine light on A reduction in fuel economy. Your catalytic converter fails unexpectedly Exhaust emissions reach undesirable levels. How to install the oxygen sensor? .
