Air/Fuel Ratio Sensor Guide for 2007-2012 Lexus GS350
Everything GS350 owners need to know before replacing a failing Air/Fuel Ratio sensor.
- Denso is the Original Equipment Manufacturer (OEM) for Lexus, making their aftermarket sensors a top-quality choice.
- The GS350 has two upstream Air/Fuel Ratio sensors (Bank 1 and Bank 2) and two downstream Oxygen sensors; make sure you order the correct one.
- Replacing a bad A/F sensor can fix issues like poor gas mileage, rough idle, and sluggish acceleration.
- You will need a special oxygen sensor socket to perform the replacement yourself.
Is Your Lexus GS350 Showing Signs of a Bad Air/Fuel Ratio Sensor?
A failing Air/Fuel Ratio (A/F) sensor can cause noticeable problems with how your GS350 drives. Because this sensor provides critical data to your engine's computer, a bad signal can throw everything off. Watch for these common symptoms.
🎬 Watch this video to see how a bad sensor behaves.- Check Engine Light: This is the most common sign. A scanner will usually show codes related to the A/F sensor's performance or its internal heater circuit.
- Worse Gas Mileage: If the computer gets bad information, it may inject too much fuel, causing you to visit the gas station more often.
- Rough Idle: The engine may sputter, vibrate, or have an unstable idle when stopped because the air-fuel mixture is incorrect at low speeds.
- Loss of Power: You might feel like your car is sluggish or slow to respond when you press the gas pedal.
- Failed Emissions Test: An incorrect air-fuel mixture leads to higher emissions, which will cause your vehicle to fail a smog check.
Air/Fuel Sensor vs. Oxygen Sensor: What's the Difference?
Your GS350 has four sensors in the exhaust. The two upstream sensors (before the catalytic converters) are Air/Fuel Ratio sensors. These are the ones that do the primary work of adjusting the fuel mixture. The two downstream sensors (after the catalytic converters) are regular Oxygen (O2) sensors. Their job is just to monitor the health of the catalytic converters. This guide is about the upstream Air/Fuel Ratio sensors.
Choosing the Right Aftermarket A/F Sensor for Your GS350
When it comes to critical engine sensors, quality matters. For your Lexus, you have excellent aftermarket options that meet or exceed original equipment standards.
- Top Tier (OEM Supplier): Denso
Denso is the original equipment manufacturer for many Toyota and Lexus parts, including these sensors. Choosing a Denso aftermarket sensor is essentially like buying the genuine Lexus part without the dealership packaging and price tag. They are designed for a perfect fit and to perform exactly like the original. - High Quality Alternative: NGK (NTK)
NGK, which markets its sensors under the NTK brand, is another major OEM supplier and a world leader in sensor technology. An NTK sensor is a reliable, high-quality choice that will restore your vehicle's performance and efficiency. Some owners and technicians consider them equal in quality to Denso.
Pro Tip: For a vehicle as precise as a Lexus, it is strongly recommended to stick with either Denso or NGK/NTK brands. While cheaper options exist, they can have different response times or build quality, potentially causing persistent issues or failing prematurely.
How Many A/F Sensors Does the 2007-2012 GS350 Have?
Your V6 engine has two upstream Air/Fuel Ratio sensors:
- Bank 1, Sensor 1: On the passenger side, before the catalytic converter. 🎬 See exactly where these sensors are located on your Lexus.
- Bank 2, Sensor 1: On the driver's side, before the catalytic converter.
It's important to identify which sensor has failed using a diagnostic scanner so you can order the correct part. The left and right sensors often have different wire lengths and part numbers.
Estimated Replacement Costs
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Denso, NGK) | $179 - $232 |
| New OEM (Lexus) | $245 - $345 |
| Shop Labor | $100 - $250 |
| Total Professional Replacement | $279 - $595 |
Prices are estimates and can vary based on location, brand, and vehicle specifics. The provided aftermarket range is based on our inventory.
Frequently Asked Questions
Can I replace just one A/F sensor?
Yes. Unlike brake pads, you only need to replace the sensor that has failed. A diagnostic scan tool will tell you which specific sensor (e.g., 'Bank 1, Sensor 1') needs replacement. However, if your car has very high mileage, be aware that the other sensor may not be far behind.
What tools do I need for this job?
You will need a special slotted socket called an 'oxygen sensor socket' to fit over the sensor and its wire. You'll also need a ratchet and possibly some extensions. Applying a good penetrating oil to the old sensor the night before you plan to work can make removal much easier, as they are often seized in the exhaust pipe.
Is this a difficult DIY job?
For the upstream A/F sensors on the GS350, the job is moderately difficult. The sensors are located in the engine bay on the exhaust manifolds. Access can be tight, especially on the driver's side, but it is generally achievable for a DIYer with the right tools. 🎬 Follow this step-by-step guide to replace your sensor. The downstream O2 sensors are a much harder job, as their connectors are inside the car under the carpet.
Are there any recalls for this part?
There are no specific recalls for the Air/Fuel Ratio sensors on the 2007-2012 Lexus GS350. However, there were recalls related to fuel delivery pipes and fuel pressure sensors, which are different parts of the fuel system.
Helpful Videos
Technical Specifications
OEM Part Numbers: 89467-30010 89467-30030
The 2007-2012 Lexus GS350 uses two upstream, wide-band Air/Fuel Ratio sensors. One for each engine bank (Bank 1 and Bank 2). These are heated, 4-wire sensors with specific wire lengths and connectors for each side.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Lexus GS350:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Lexus GS350 Showing Signs of a Bad Air/Fuel Ratio Sensor?
- Air/Fuel Sensor vs. Oxygen Sensor: What's the Difference?
- Choosing the Right Aftermarket A/F Sensor for Your GS350
- How Many A/F Sensors Does the 2007-2012 GS350 Have?
- Estimated Replacement Costs
- Frequently Asked Questions
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