---
product_id: 18724666
title: "234-9123 Oxygen Sensor (Air And Fuel Ratio Sensor), Regular (2349123)"
brand: "denso"
price: "$955638"
currency: COP
in_stock: true
reviews_count: 12
category: "Denso"
url: https://www.desertcart.co/products/18724666-234-9123-oxygen-sensor-air-and-fuel-ratio-sensor-regular
store_origin: CO
region: Colombia
---

# Optimizes fuel efficiency Operates up to 800°C Universal thread-in fit 234-9123 Oxygen Sensor (Air And Fuel Ratio Sensor), Regular (2349123)

**Brand:** denso
**Price:** $955638
**Availability:** ✅ In Stock

## Summary

> 🔥 Upgrade your ride with precision fuel sensing—because every drop counts!

## Quick Answers

- **What is this?** 234-9123 Oxygen Sensor (Air And Fuel Ratio Sensor), Regular (2349123) by denso
- **How much does it cost?** $955638 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co](https://www.desertcart.co/products/18724666-234-9123-oxygen-sensor-air-and-fuel-ratio-sensor-regular)

## Best For

- denso enthusiasts

## Why This Product

- Trusted denso brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Fuel & Emission Optimizer:** Cuts fuel consumption and harmful emissions for eco-conscious driving.
- • **Precision OE Standard Fit:** Exact replacement for seamless installation—no guesswork, no delays.
- • **Maximized Engine Performance:** Fine-tunes fuel mix to boost power and smooth out your ride.
- • **Durable High-Temp Construction:** Built to withstand extreme heat—reliable performance mile after mile.
- • **Zirconia Solid Electrolyte Tech:** Advanced sensor material ensures ultra-responsive air/fuel ratio detection.

## Overview

The Denso 234-9123 Oxygen Sensor is a high-quality, universal-fit air/fuel ratio sensor engineered with zirconia solid electrolyte for precise exhaust gas monitoring. Designed to meet strict OE standards, it enhances engine performance, improves fuel efficiency, and reduces emissions. Compatible with select Subaru and Saab models, it features durable stainless steel construction and operates reliably up to 800°C, ensuring long-lasting, first-time fit replacement.

## Description

Denso part number 234-9123 is a replacement air/fuel ratio sensor for 2006 Saab 9-2X, 2006-2010 Subaru Forester, 2006-2011 Subaru Impreza, 2006-2009 Subaru Legacy, and 2006-2009 Subaru Outback vehicles.Denso Air/Fuel Ratio Sensors are manufactured and tested to the strictest OE standards for unparalleled performance. Each component is precision-built for exact replacement, and a first time fit. The superior design of Denso Air/Fuel Ratio Sensors maximizes engine performance and fuel efficiency while reducing fuel consumption and harmful emissions. Denso Air/Fuel Ratio Sensors increase performance by mapping air/fuel ratios throughout the RPM range. They also reduce emissions by keeping the air-fuel mixture at an optimum ratio. Optimal air/fuel ratios reduce fuel consumption and maximize catalytic converter life. Denso gives you the right part and the right fit, the first time..

Review: Worked great on my EJ253! - I own a 2008 5MT Outback with over 200k. The car has been fantastic. For the last couple years I've been getting a random "Catalyzer below threshold" code. I thought it was time to replace the cat converter (not surprising giving the miles). But I decided to try the anti fouler bung on the O2 sensor. It worked for a while, but my check engine light kept coming back while in the highway, disabling my cruise control (some "lean condition" code. On these Subarus, and many newer cars, the downstream sensor (after the converter), is not only to check the efficiency of the converter but also has something to do with the fuel trim). I finally decided to replace both O2 sensors (the car well deserves new sensors after all these years), and sure enough, the check engine light has not returned, engine runs smoother, and I should expect some improvement in the fuel mileage. So, if you're on the same boat, replacing both O2 sensors quite probably will do the trick, and it's way cheaper than the catalytic converter. One last thing....as many people before me pointed out...don't use cheaper sensors. These Denso ones are OEM, and work fine.
Review: Exactly like the original. - Fit my 2009 Forester non turbo perfectly. The length was exactly like the original and even had the original style lead clip.

## Features

- Efficient Fuel Consumption
- Constructed from durable material
- Features zirconia solid electrolyte
- Manufactured to detect the amount of exhaust gas air fuel ratio
- Fit type: Universal Fit

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001F7EK44 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #98,616 in Automotive ( See Top 100 in Automotive ) #259 in Automotive Replacement Oxygen Sensors |
| Brand | Denso |
| Color | Regular |
| Customer Reviews | 4.6 4.6 out of 5 stars (507) |
| Date First Available | January 2, 2007 |
| Global Trade Identification Number | 00042511115347 |
| Included Components | Air/Fuel Ratio Sensor |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 4 ounces |
| Item dimensions L x W x H | 5.75 x 2.19 x 1.88 inches |
| Item model number | 234-9123 |
| Manufacturer | DENSO |
| Material | Stainless Steel, Zirconium |
| Mounting Type | Thread-In |
| Output Type | NPN |
| Part Number | 234-9123 |
| Product Dimensions | 5.75 x 2.19 x 1.88 inches |
| Specific Uses For Product | Replacement Air/Fuel Ratio Sensor |
| Style | Replacement Part |
| UPC | 042511115347 |
| Upper Temperature Rating | 800 Degrees Celsius |
| Warranty Description | Manufacturer Warranty |

## Product Details

- **Brand:** Denso
- **Item Weight:** 4 ounces
- **Item dimensions L x W x H:** 5.75 x 2.19 x 1.88 inches
- **Material:** Stainless Steel, Zirconium
- **Style:** Replacement Part

## Images

![234-9123 Oxygen Sensor (Air And Fuel Ratio Sensor), Regular (2349123) - Image 1](https://m.media-amazon.com/images/I/51ycWL8hDuL.jpg)

## Questions & Answers

**Q: Is this compatible to the subaru oem part # 22641aa36a?**
A: I don't know how this part relates to any Subaru part numbers.
I installed this on a 2007 Outback with a 2.5 L SOHC engine; the engine has run fine since installation and the MIL has not lit.
As I stated in my review, the plug end was different than the original part, so I had to splice the original plug onto this sensor.
I checked and double-checked the part number, and this one comes up as the correct part, so perhaps my car was built with an oddball plug.
If your car has the same plug as mine and you don't want to splice it, it may be worthwhile for you to get a sensor from Subaru.

**Q: Anyone know where i can get an extension for this o2 sensor: denso 234-9123 oxygen sensor**
A: Spark plug anti-foul extenders are sometimes used as downstream O2 sensor extenders to "fix" PO420 codes, and are available here and in parts stores. 

The thread size and pitch, for this application should be M18 X 1.5. You need to drill out the end. 

This trick can work for downstream sensors on some vehicles, but I doubt it will work for upstream sensors. It may cause error codes and also cause the engine to run poorly because the sensor will receive inaccurate information about the oxygen concentration in the exhaust and thereby cause the fuel air mix to deviate from the correct stoichiometric ratio.

I'm just a home mechanic, so take my words with an appropriate sized grain of salt, but that is what makes sense to me based on my knowledge. If the upstream sensor is bad it should be replaced. If the sensor is good but the problem is with the engine, it is best to address the root cause of the problem.

**Q: Camshift actuator sensor location**
A: What kind of car?   Usually located on head near the back of camshaft.

**Q: I got a P0172 code ( system too rich bank 1) on my 2009 subaru impreza anesis 1.5L what is the problem ?**
A: Engine running too rich could come from many things, so if you have the knowledge, tools and time it is better to address the problem methodically rather than buying parts and hoping for the best. It could be a leaky vacuum hose, dirty throttle throttle body, dirty IACV (if the car has it), bad MAP sensor, leaky exhaust system, worn spark plugs, bad oxygen sensor, perhaps even misfire from a bad coil. In my opinion the oxygen sensor is not high on the list, and is among the more expensive possible culprits. If you don't want to or can't do the troubleshooting, it may be best to take the car to a competent mechanic.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worked great on my EJ253!
*by A***R on November 12, 2024*

I own a 2008 5MT Outback with over 200k. The car has been fantastic. For the last couple years I've been getting a random "Catalyzer below threshold" code. I thought it was time to replace the cat converter (not surprising giving the miles). But I decided to try the anti fouler bung on the O2 sensor. It worked for a while, but my check engine light kept coming back while in the highway, disabling my cruise control (some "lean condition" code. On these Subarus, and many newer cars, the downstream sensor (after the converter), is not only to check the efficiency of the converter but also has something to do with the fuel trim). I finally decided to replace both O2 sensors (the car well deserves new sensors after all these years), and sure enough, the check engine light has not returned, engine runs smoother, and I should expect some improvement in the fuel mileage. So, if you're on the same boat, replacing both O2 sensors quite probably will do the trick, and it's way cheaper than the catalytic converter. One last thing....as many people before me pointed out...don't use cheaper sensors. These Denso ones are OEM, and work fine.

### ⭐⭐⭐⭐⭐ Exactly like the original.
*by G***N on July 13, 2025*

Fit my 2009 Forester non turbo perfectly. The length was exactly like the original and even had the original style lead clip.

### ⭐⭐⭐⭐⭐ Good Quality
*by J***H on July 29, 2025*

It works perfectly

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.co/products/18724666-234-9123-oxygen-sensor-air-and-fuel-ratio-sensor-regular](https://www.desertcart.co/products/18724666-234-9123-oxygen-sensor-air-and-fuel-ratio-sensor-regular)

---

*Product available on Desertcart Colombia*
*Store origin: CO*
*Last updated: 2026-01-23*