Saab 9-5 Engine Crankshaft Position Sensor Guide (1999-2004)
Solve the classic hot-engine no-start and stalling issues common in the 1999-2004 Saab 9-5.
- The most common failure symptom is a 'hot no-start' condition where the engine cranks but won't start until it cools down.
- Only install a Bosch brand sensor; it is the OEM part and is known to be far more reliable than other aftermarket options for this car.
- A tachometer that shows zero RPM during cranking is a key indicator of a failed crankshaft position sensor.
- Replacement is difficult due to the sensor's location on the back of the engine, requiring patience and work in tight quarters.
Understanding Crankshaft Sensor Failure in Your 9-5
The crankshaft position sensor is a known failure point on the 1999-2004 Saab 9-5, with symptoms that can be confusing at first. The most common failure mode is related to heat. As the sensor ages, its internal electronics become sensitive to high temperatures in the engine bay. When the engine is hot, the sensor's resistance can change, causing it to stop sending a signal. After the engine cools down for 30-60 minutes, the sensor may work again, leaving you stranded intermittently.
The Classic Sign: Hot No-Start
The most reported complaint is driving the car until it reaches full operating temperature, turning it off (e.g., to go into a store), and then returning to a car that cranks but will not start. After letting the car cool down completely, it starts up as if nothing was wrong. This is a textbook symptom of a failing 🎬 Watch: How to fix the hot start issue by replacing the CPS crankshaft position sensor in a Saab 9-5.
Choosing the Right Aftermarket Sensor: A Strong Recommendation
When it comes to this specific part for your Saab, the choice of brand is critical. Owner experiences are very clear on this topic.
- Tier 1 (OEM Recommended): Bosch
Bosch is the Original Equipment Manufacturer (OEM) for the Saab 9-5 crankshaft position sensor. Across numerous forums and owner reviews, the consensus is to only use the Bosch sensor for this repair. Owners who have tried cheaper aftermarket brands frequently report that the parts fail quickly, sometimes within a few months or even days, forcing them to do the difficult replacement job a second time. Paying the extra for the Bosch part is highly recommended to ensure reliability and avoid repeated repairs. - Tier 2 (Use with Caution): Other Aftermarket Brands
While many brands like Delphi, Hella, Standard Ignition (SMP), and Dorman are available, they are not recommended for this specific application by the Saab community. The risk of premature failure is high, and any cost savings are often lost when the part needs to be replaced again. If you must use a non-Bosch part as a temporary measure, understand that it may not be a long-term solution.
Pro Tip: Check the Tachometer
If you suspect a bad crankshaft position sensor, watch the tachometer (RPM gauge) while cranking the engine. If the needle does not move or even wiggle slightly, it's a strong indication the ECU is not receiving a signal from the CPS, making it the most likely cause of your no-start condition.
Cost of Replacing the Saab 9-5 Crankshaft Position Sensor
| Part/Service | Estimated Cost |
|---|---|
| New OEM (Bosch) Part | $55 - $90 |
| New Aftermarket Part | $21 - $116 |
| Shop Labor | $120 - $250 |
| Total Professional Replacement (OEM Part) | $175 - $340 |
Frequently Asked Questions (FAQ)
Where is the crankshaft position sensor located on the 1999-2004 Saab 9-5?
The sensor is located on the rear of the engine block, near the firewall, where the engine and transmission meet. It is positioned just above the exhaust pipe and is notoriously difficult to access 🎬 Watch: Step-by-step replacement guide for the 3.0L V6 engine from both the top and bottom of the car due to tight spaces. It is held in by a single T30 Torx bolt.
🎬 See this walkthrough for changing the sensor yourselfWhat are the Check Engine Light codes for a bad crankshaft sensor?
The most common codes are P0337 (Crankshaft Position Sensor 'A' Circuit Low), which often appears during a no-start condition, and P0336 (Crankshaft Position Sensor 'A' Circuit Range/Performance), which can be triggered while driving. It is possible for the sensor to fail intermittently without immediately setting a code.
Is the OEM Bosch sensor really worth the extra cost?
Yes. The overwhelming feedback from Saab owners and mechanics is that cheaper, non-OEM sensors are unreliable and fail quickly for this specific part. Given that the replacement is difficult due to poor access, using the proven Bosch OEM part is the best way to ensure you only have to do the job once.
Why does the sensor only fail when the engine is hot?
This is a classic symptom of electronic component failure called "heat soak." As the sensor ages, the fine wires and electronics inside can develop tiny cracks or weaknesses. When the engine gets hot, these materials expand, which can cause the electrical connection to break. Once the engine cools, the components contract, and the connection can be restored, allowing the car to start again.
Helpful Videos
Technical Specifications
OEM Part Numbers: 9177221 8602613 90537338
Bosch Part Number: 0261210269. Sensor Type: Inductive. Connector: 3-pin. Includes O-ring.
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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.
- Saab 9-5:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Understanding Crankshaft Sensor Failure in Your 9-5
- The Classic Sign: Hot No-Start
- Choosing the Right Aftermarket Sensor: A Strong Recommendation
- Pro Tip: Check the Tachometer
- Cost of Replacing the Saab 9-5 Crankshaft Position Sensor
- Frequently Asked Questions (FAQ)
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