🔧 Enhanced Denso 234-4138 Oxygen Sensor for Optimal Performance Review

The fault light came on. Standard front O2 sensor, left bank. It came quickly. My mechanic had no problems with the installation and the fault light has been off for 4 months now. And I'm sure he'll stay out. very satisfied with price and quality.

Fit my 04 4Runner in front of the driver's cat. All it needed was a 22mm wrench. No special tool to remove the oxygen sensor. Fender skirt removed and driver's side jacked up, giving a little more ground clearance. Later, the 4th generation will need a different sensor. Check out the Denso website.

I bought this O2 sensor because I had a bad one (DTC on OBD2) and I bought this Denso sensor because they are an OEM supplier. Revain also had the best price I could find. So far it has worked great and was very easy to install. I hope it lasts the same 17 years as the original.

Installed perfectly. Looks like a bearing sensor. That's how it should be, because Denso is an OEM supplier. The replacement took about 20 minutes. I recommend buying a cheap oxygen sensor socket. The right tool makes the job easier. Comes with a small tube of anti-seize lube. (I think. It might have been a dielectric. I don't remember). However, after the installation I cleared the code with a cheap OBD II scanner and it didn't come back like it did about 5 times before the installation. 4000…

Fixed Check Engine Light on 2002 LandCruiser. The engine is now smoother than ever, has more power and uses less fuel. No, it's understandable. Replace both upstream sensors at the same time and only use similar OEMs. Easy replacement, the most difficult but still not difficult part is taking off the pig's tail. Use a good penetrating liquid like PB or the latest offering from Lucass. Wait at least an hour for the penetrating liquid to be absorbed. Use a 22mm or 7/8" box end wrench. Easiest O2…

I put 1 to be noticed. Great product but poor part number identification. The Revain and Denso websites say this part fits my 2004 4Runner, but that's not true. I called the Toyota dealership and had to look up Toyota OEM parts by VIN as there are several listed for that year, make, model and engine. To make matters worse, the Toyota part number doesn't overlap with the Denso part number, so I ordered the part from the dealer for almost $200. See photo for comparison. Wires of different lengths

Terrible CEL (and VSC lights) came on and after furiously googling I needed a new A/F ratio sensor (because it's upstream, not an oxygen sensor). For less than $40, decided to try that first before considering a new catalytic converter and looking somewhere for a possible exhaust leak (both are entirely possible at 320,000 miles). After we unplugged the old A/F sensor (it took 20 minutes to get off the driver's side wheel well) and turned this baby on with a rental advanced auto parts oxygen…

I bought it based on the Denso part number and wanted to replace it in my car. People made the same mistake so I'm doing this review so you know better Wire was too short because I changed the wrong one, it was sensor 1 bank 1 which is behind the steering wheel when I change the right one was everything perfect my check engine light went out everything is fine same problem as me it is from the driver side behind the steering wheel to disconnect the electrical connection just push on one side…