Ignition Knock Sensor for the 2003-2010 Chrysler Cirrus and Sebring
Understanding how to diagnose and choose the right replacement knock sensor for your Chrysler.
- This guide applies to the Chrysler Sebring in the US/Canada and the Cirrus in Mexico for these model years.
- Replacement is a very labor-intensive job, as the sensor is located under the intake manifold.
- Due to high labor costs, using a top-tier aftermarket brand like NGK or an OEM part is strongly recommended over budget options.
- The sensor's mounting bolt must be tightened to a specific torque with a torque wrench to function correctly.
A Note on Vehicle Names
This guide covers the 2003-2010 Chrysler Cirrus. In the United States and Canada, this vehicle is known as the Chrysler Sebring. The Cirrus name was used for the same vehicle in the Mexican market during these years. All information presented here applies to both the Cirrus (Mexico) and the Sebring (US/Canada) models from 2003-2010.
Symptoms of a Failing Knock Sensor
When a knock sensor fails, the engine's computer loses its ability to detect detonation. To protect the engine, it will default to a 'safe' mode with very conservative ignition timing. This leads to several noticeable symptoms that can affect your car's drivability.
High-Labor Replacement
On all engines available for the 2003-2010 Cirrus and Sebring (2.4L, 2.7L, and 3.5L), the knock sensor is located on the engine block, underneath the upper intake manifold. Replacing it is a labor-intensive job that requires removing the manifold, which can take several hours. Because of the high labor cost, choosing a reliable, high-quality sensor is critical to avoid paying for the same repair twice.
Choosing the Right Aftermarket Knock Sensor
Given the difficulty of this repair, the quality of the replacement part is more important than a small difference in price. A cheap sensor that fails prematurely will cost you far more in repeat labor charges. Aftermarket brands can be grouped into tiers based on quality and reputation.
- Top Tier (OEM-Equivalent): Brands like NGK (also sold as NTK) and Delphi are often original equipment suppliers for many automakers. These parts are manufactured to meet or exceed factory specifications and offer the best reliability. For a difficult job like this, choosing a top-tier brand is a smart investment.
- Standard Tier: Standard Ignition (Standard Motor Products or SMP) is a well-established aftermarket brand offering a balance of quality and cost. They are a reliable choice for owners looking for a solid part without the OEM price tag.
- Economy Tier: Brands like Holstein offer a budget-friendly price point. While they may come with a good warranty, for a part that requires hours of labor to access, the risk of premature failure can outweigh the initial savings. These are best considered only when budget is the primary concern.
Cost to Replace a Chrysler Cirrus/Sebring Knock Sensor
The total cost is heavily influenced by high labor charges due to the sensor's location under the intake manifold.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $21.01 - $83.00 |
| New OEM Part (Mopar) | $115 - $150 |
| Shop Labor | $250 - $400 |
| Total Professional Replacement | $365 - $550 |
Torque Specification is Critical
The knock sensor must be tightened to a precise torque value (e.g., 195 in-lbs for the 2.4L engine). Over-tightening or under-tightening the bolt changes the sensor's sensitivity and will cause it to send incorrect signals. This can result in a persistent Check Engine Light even after replacing the part. Always use a torque wrench for installation.
Frequently Asked Questions
Where is the knock sensor located on the 2003-2010 Chrysler Cirrus/Sebring?
For all engine options (2.4L I4, 2.7L V6, 3.5L V6), the knock sensor is bolted to the engine block, underneath the intake manifold. Access requires removing the upper intake manifold assembly.
Why is my Check Engine Light still on after replacing the knock sensor?
There are three common reasons. First, the replacement sensor may be faulty, which is a higher risk with budget brands. Second, the sensor's mounting bolt may have been torqued incorrectly. Third, the issue could be in the wiring harness or connector, not the sensor itself.
Are there any recalls for the knock sensor on this car?
No, there are no specific safety recalls or technical service bulletins (TSBs) for a faulty knock sensor on the 2003-2010 Chrysler Cirrus or Sebring. However, other unrelated recalls exist, so it's always wise to have a professional diagnose the Check Engine Light properly.
Is an OEM Mopar sensor better than aftermarket for this part?
For a part this difficult to replace, using an OEM Mopar part or a top-tier aftermarket brand like NGK/NTK is strongly recommended. The higher initial cost is justified by the lower risk of part failure and having to pay for the expensive labor a second time.
Technical Specifications
OEM Part Numbers: 56028563AA 5033316AB MD304933 5033316AA
The knock sensor for the Chrysler Cirrus/Sebring is a piezoelectric sensor that generates an AC voltage signal in response to engine vibrations. It typically uses a 2-pin rectangular connector.
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.
- Chrysler Cirrus: