Review on NTK 21066 Oxygen Sensor by Oscar Chambers

Perfect replacement for my Silverado. This is a replacement for the downstream (post catalyst) O2 sensor. The check engine light went out immediately after installation. It's easy to replace, but I'd recommend buying a special nozzle ($10 here at Revain) to loosen the old one and squirt it with a liquid wrench before attempting to remove it. It was also a lot cheaper than the national parts store for the exact same product.