1998-1999 Oldsmobile Intrigue Engine Intake Manifold Temperature Sensor Guide
If your Intrigue is running rough or getting poor gas mileage, a faulty air temperature sensor could be the culprit.
- A bad IAT sensor will almost always cause a Check Engine Light with codes P0112 or P0113.
- Symptoms include poor gas mileage, rough idle, and difficulty starting.
- Replacement is extremely easy for DIYers, taking less than 15 minutes with no special tools.
- For this repair, a quality aftermarket brand like Standard Ignition is a reliable and cost-effective choice.
Is Your Intrigue Showing Signs of a Bad IAT Sensor?
When the Intake Air Temperature (IAT) sensor on your 1998 or 1999 Oldsmobile Intrigue starts to fail, your car's main computer (PCM) gets bad information. This can cause a number of problems because the computer can't properly adjust the air-fuel mixture. You will almost certainly get a Check Engine Light on your dashboard. You might also notice your engine running rough, especially at idle, or hesitating when you try to accelerate. Other common issues include having a hard time starting the engine, particularly in cold weather, and seeing a noticeable drop in your gas mileage.
Known Issues for 1998-1999 Oldsmobile Intrigue
There are no recalls or specific Technical Service Bulletins (TSBs) directly related to the Intake Air Temperature sensor for this vehicle. However, a significant safety recall was issued for the 1998-1999 Intrigue with the 3.8L V6 engine because engine oil could leak onto the hot exhaust manifold, creating a fire risk. This is unrelated to the IAT sensor but is a critical safety issue for all owners to be aware of.
Choosing the Right Aftermarket IAT Sensor
For a vehicle like the 1998-1999 Intrigue, an original OEM sensor from GM may be difficult to find or expensive. Aftermarket sensors are a very practical and affordable choice. The key is to choose a brand with a good reputation. For a simple but important sensor like the IAT, you don't need to break the bank.
Brand Quality Tiers:
- Standard Ignition (Good): Standard is a well-known and trusted aftermarket brand that has been around for a long time. Their sensors are generally considered to be reliable, quality replacements that meet or exceed original specifications. This is a solid choice for a dependable repair.
- True Tech (Budget): True Tech is a more budget-friendly option. While it will get the job done, it may not have the same long-term reliability or precise manufacturing tolerances as a more established brand like Standard Ignition. For a critical sensor, spending a few extra dollars on a known brand is often a good investment.
Pro Tip: Easy DIY Replacement
Replacing the IAT sensor on the GM 3.8L V6 engine is one of the easiest repairs you can do. The sensor is located in the flexible black air intake tube between the air filter box and the engine. It is simply pushed into a rubber grommet. The job involves unplugging the electrical connector, wiggling the old sensor out, pushing the new one in, and reconnecting the plug. This can be done in less than 15 minutes with no special tools.
Cost of Replacing the IAT Sensor
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Standard, True Tech) | $19 - $23 |
| Shop Labor | $25 - $50 |
| Total Estimated Cost (DIY) | $19 - $23 |
| Total Estimated Cost (Shop) | $44 - $73 |
Frequently Asked Questions (FAQ)
Where is the IAT sensor located on a 1998-1999 Intrigue?
The IAT sensor is located in the large, flexible black plastic tube that connects your air filter box to the engine's throttle body. It is a small plastic sensor with a two-wire electrical connector, pushed into a grommet on the side of this tube.
Can I drive my Intrigue with a bad IAT sensor?
Yes, you can usually drive the vehicle. The engine's computer will recognize the sensor has failed and will switch to a default "safe" mode. This will likely cause the engine to run rich (using too much fuel), resulting in poor performance and bad gas mileage until the sensor is replaced.
What do the trouble codes P0112 and P0113 mean?
These are the most common codes for a failed IAT sensor. P0112 means the sensor circuit is reading low (or abnormally cold), often due to a short in the wiring. P0113 means the sensor circuit is reading high (or abnormally hot), which can be caused by a bad sensor or a break in the wiring.
Do I need to disconnect my battery or reset the computer after replacement?
It is good practice to disconnect the battery's negative terminal before working on any electrical sensor. After replacing the sensor, the Check Engine Light may turn off on its own after a few driving cycles. If it doesn't, you can clear the code with a basic OBD-II scanner or by disconnecting the battery for about 15 minutes.
Technical Specifications
OEM Part Numbers: 25166816
2-Terminal, Push-in Mount
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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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