Review on Enhance Engine Efficiency with Denso 234-4077 Oxygen Sensor by Braden Douville

Handling Problem Solved After 30 seconds my newly purchased 1997 Jeep Wrangler TJ ran rough and wobbly for another 30 seconds. This is actually quite dangerous as you don't want to get stuck in traffic and stall. The previous owner just lived with the problem, but I wanted to find a solution. The solution was the Denso upstream oxygen sensor. The old oxygen sensor was sending incorrect data to the computer, causing the air/fuel ratio to be incorrect for a short time until the engine warmed up. The installation took only 20 minutes. The connector fits my 1997 Jeep Wrangler 2.5L 4cyl exactly so no modifications. Make sure you purchase a 7/8" (22mm) oxygen sensor socket so you don't damage the new sensor when installing it.