TLDR Review: Denso 234-4233 Oxygen Sensor
Pros
- •Provides genuine OEM quality ensuring a perfect fit and reliable performance for Toyota Corollas, especially models around 200006.
- •Effectively resolves common emissionelated error codes like P0420, P0440, P0441, and P0446 without expensive replacements such as catalytic converters or evap canisters.
- •Successfully fixes the dreaded Check Engine light and catalytic system efficiency codes, helping vehicles pass smog tests.
- •Durable design with a proven service life of around 100,000 miles, working well even in higileage cars (over 220,000 miles).
- •Offers excellent value by preventing costly repairs through a straightforward sensor replacement.
- •Easy installation with clear guidance, especially when using a 7/8" O2 sensor socket and anteize lubricant included for sensor threads.
- •Installation is accessible by removing the carpet and working from underneath the vehicle, with helpful resources like YouTube tutorials available.
- •Users appreciate that the sensor is a direct replacement that restores proper emissions readings and improves gas mileage.
- •Cleaning related electrical contacts improves overall sensor function, an extra tip shared by experienced installers.
Cons
- •Installing the sensor requires some effort: removal of carpet, working under the car using ramps or jacks, and loosening a possibly tight 22mm sensor with W0—so don't expect a quick DIY for beginners.
- •Some users note the necessity to replace both upstream and downstream O2 sensors and ensure a proper factory gas cap to fully resolve emissions issues, which adds to overall costs.
- •After installation, resetting error codes and driving for about 20 miles is needed to confirm the fix, meaning you might not see instant results.
- •NoEM sensors often fail to clear codes, emphasizing that cheaper alternatives may not be reliable—so this sensor’s price reflects its OEM quality.
- •Additional repairs or maintenance may be required for issues like exhaust leaks, dirty mass airflow sensors, or fouled spark plugs if problems persist after sensor replacement.
Bottom Line
If you're battling those persistent emissions codes (especially the notorious P0420) on a mid-2000s Toyota Corolla, the Denso 234-4233 Oxygen Sensor is a smart move. Its OEM quality ensures a perfect fit and reliable long-term performance, saving you from expensive catalytic converter replacements. However, be prepared for some moderate installation work and the possibility that related repairs might still be needed for a complete fix. For anyone looking for a proven, durable, and cost-effective sensor solution that actually clears check engine lights and passes smog tests, this is the sensor to get.
Download ShopSavvy App
Compare prices for anything in real-time, set price alerts, watch for deals by keyword, and much more
Install ShopSavvy Browser Extension
Compare and track prices automatically while you shop online at thousands of websites.
Footer 1
Subscribe for Updates
Get the latest news, and updates on ShopSavvy. You'll be glad you did!