A Comprehensive Guide to Aftermarket Oxygen Sensors for the 2005-2007 Saturn Relay
Keep your Saturn Relay running smoothly and efficiently by understanding and choosing the right replacement oxygen sensor.
- Your Saturn Relay has at least two oxygen sensors (upstream and downstream) that are not interchangeable.
- For best results and to avoid compatibility issues, choose an OE-equivalent brand like ACDelco, Denso, or NGK/NTK.
- A failing oxygen sensor will trigger the Check Engine Light with codes like P0135 or P0141.
- Replacing a bad sensor promptly can prevent damage to your expensive catalytic converter and restore fuel economy.
Symptoms of a Failing Oxygen Sensor
A bad oxygen sensor can cause several noticeable problems. The most common sign is the check engine light illuminating on your dashboard. Other symptoms include reduced fuel efficiency, a rough or shaky idle, and sluggish engine performance. 🎬 Watch this video to learn more about bad O2 sensor symptoms. In some cases, you might notice a sulfur or "rotten egg" smell from the exhaust, which indicates the catalytic converter isn't working correctly due to bad data from the O2 sensor. Ignoring these signs can lead to more expensive repairs down the road.
Check Engine Light Codes
If your check engine light is on, a code scanner will often show codes related to the oxygen sensor. Common codes for the Saturn Relay include:
- P0131, P0132, P0133, P0134, P0135: Related to the upstream sensor (Bank 1, Sensor 1).
- P0137, P0140, P0141: Related to the downstream sensor (Bank 1, Sensor 2).
- P0152, P0175: Codes indicating issues on Bank 2, which may point to a sensor problem.
These codes help pinpoint which sensor has failed, as your vehicle has more than one.
Choosing the Right Aftermarket Oxygen Sensor
When replacing an oxygen sensor on your 2005-2007 Saturn Relay, you have several aftermarket brand choices. Since General Motors (GM) produced your vehicle, ACDelco is the Original Equipment (OE) supplier. Aftermarket parts from OE suppliers are often identical to the factory part.
Brand Quality Tiers
- Tier 1: OE-Equivalent Quality: Brands like ACDelco, Denso, and NGK/NTK are highly recommended. ACDelco is the original part manufacturer for your Saturn. Denso and NGK/NTK are also major OE suppliers known for their reliability and are often considered equal to or better than the original parts. Many owners and mechanics stick with these brands to avoid compatibility issues.
- Tier 2: Reputable Aftermarket: Bosch and Delphi are well-known brands that produce quality sensors. While many have success with Bosch, some GM vehicle owners report occasional compatibility issues that are not present with ACDelco or Denso. Delphi was once part of GM and generally offers reliable parts.
- Tier 3: Budget-Friendly: Brands like DriveWire, Spectra, and Walker Products offer more affordable options. These can be a good choice if budget is the primary concern, but they may not have the same longevity or precise calibration as the higher-tier brands.
Upstream vs. Downstream
Your Relay has at least two sensors: one upstream (before the catalytic converter) and one downstream (after the converter). They are not interchangeable. Always verify the correct position for the part you are ordering. The upstream sensor affects engine performance directly, while the downstream sensor primarily monitors the catalytic converter's efficiency.
Cost to Replace an Oxygen Sensor
The cost can vary depending on whether you do the work yourself or hire a professional. The parts themselves are affordable, but labor can add to the total cost.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Oxygen Sensor | $37 - $102 |
| Shop Labor | $63 - $100 |
| Total Professional Replacement | $150 - $500 per sensor |
Frequently Asked Questions (FAQ)
Can I drive my Saturn Relay with a bad oxygen sensor?
Yes, but it is not recommended for long periods. A bad sensor will cause poor fuel economy and performance, and can eventually lead to costly damage to your catalytic converter.
How many oxygen sensors does a 2005-2007 Saturn Relay have?
The V6 engines in the Saturn Relay have at least two oxygen sensors: one upstream (Bank 1, Sensor 1) 🎬 See how to remove a front upstream oxygen sensor. and one downstream (Bank 1, Sensor 2). Some configurations may have more, depending on the exhaust setup.
Is it difficult to replace an oxygen sensor myself?
For a DIYer with the right tools, it's a manageable job. It requires an oxygen sensor socket, a ratchet, and potentially some penetrating oil to loosen the old sensor. The difficulty often depends on the sensor's location and how corroded it is. 🎬 Follow this step-by-step guide to change your oxygen sensor. The upstream sensor is often near the engine, while the downstream sensor is further down the exhaust pipe.
Are there any recalls for the Saturn Relay oxygen sensor?
No, there are no specific recalls for oxygen sensors on the 2005-2007 Saturn Relay. There are also no widely reported Technical Service Bulletins (TSBs) for this specific issue on this model.
Helpful Videos
Technical Specifications
The Saturn Relay uses a heated 4-wire oxygen sensor. The 2005 model year was equipped with a 3.5L V6 engine, while the 2006-2007 models used a 3.9L V6. Ensure the part you select is correct for your specific engine.
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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.
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