2012 Volvo S60 Has Rough Idle

Identifying Causes of Rough Idle in Your 2012 Volvo S60 and How to Resolve the Issue

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
21% chance it's the
Spark Plugs
0%
15% chance it's the
Ignition Coil
0%
64% chance it's
Something else
The most common reasons a 2012 Volvo S60 has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
  • Spark Plugs: Worn or fouled spark plugs can lead to misfires, poor fuel economy, and difficulty starting the engine.
  • Ignition Coil: A faulty ignition coil can cause misfires, rough idling, and difficulty starting the engine due to inadequate spark delivery to the spark plugs.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2012 Volvo S60 has rough idle?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Here are a few common symptoms of worn-out brake pads:

  1. Low brake pad warning light is on: Not all vehicles are equipped with this system, but if yours is, this dashboard indicator light will likely be the first signal it’s time to replace your brake pads.
  2. Brakes start to squeal regularly: This is often one of the first signs of worn brake pads and is caused by a metallic piece built into brake pads for this exact purpose. This part contacts the brake rotor to make a squealing or whining noise when the pads are low.
  3. Brakes make loud grinding noise: If not addressed early enough, your brake pads may get so worn that the metal backing plate of the pad grinds against the metal rotor.
  4. Brake pads look thin: You may be able to visually check your brake pad thickness to determine if they need replacement.

Most often, a brake system inspection will just be a routine portion of manufacturer specified maintenance, and will be performed at mileage intervals. In those cases, there will likely be no symptoms. However, when a brake system makes a funny noise, causes vibration, is hard to use, will not slow the vehicle, prevents the vehicle from driving, makes the vehicle pull to one side, or leaks brake fluid, the vehicle will need a visit dedicated to the inspection of the brake system.

What are the steps to diagnose a rough idle in a 2012 Volvo S60?

To effectively diagnose a rough idle in your 2012 Volvo S60, start with the simplest checks before moving on to more complex diagnostics. Begin by observing the check engine light; if it’s illuminated, this could point to underlying issues that need addressing. Next, pay attention to the engine's RPMs at idle; if they are higher than normal, this could indicate a problem. While the engine is running, listen for any hissing sounds, which may suggest vacuum leaks. A visual inspection of the vacuum lines is also crucial; look for any cracks or breaks that could be contributing to the rough idle. If you suspect the idle air control valve is dirty or malfunctioning, consider cleaning or replacing it, as this component plays a vital role in maintaining a stable idle. Finally, ensure that any identified vacuum leaks are repaired to promote a proper air-fuel mixture, which is essential for smooth engine operation. By following this diagnostic approach, you can systematically identify and resolve the issues causing the rough idle in your vehicle.

What are the common problems that could cause a rough idle in a 2012 Volvo S60?

When experiencing a rough idle in your 2012 Volvo S60, it's essential to consider several common problems that could be at fault. One significant issue could be a faulty knock sensor, which affects engine combustion timing and can lead to an uneven idle. Additionally, if your vehicle runs smoothly but still exhibits rough idling, the problem might stem from the instrument cluster. In this case, checking the fuse for the instrument panel and using a Volvo scanner to read fault codes can provide valuable insights. Another critical factor to investigate is a misfiring cylinder, which may present symptoms such as fluctuating RPMs or the engine stalling at low speeds. This misfire could be linked to a malfunctioning injection pressure regulator (IPR) valve. By addressing these potential issues promptly, you can prevent further complications and maintain the optimal performance of your Volvo S60.

How urgent is it to address the rough idle in a 2012 Volvo S60?

Addressing a rough idle in your 2012 Volvo S60 is not just a matter of comfort; it is crucial for the overall health of your vehicle. A rough idle can signal various underlying problems, such as engine misfires, fuel system malfunctions, or emissions component failures. Ignoring these symptoms can lead to decreased fuel efficiency and drivability issues, which may escalate into more severe engine damage over time. For instance, a faulty knock sensor can disrupt engine combustion timing, further compromising performance and potentially leading to costly repairs. By diagnosing and repairing the rough idle promptly, you can prevent these complications, ensuring your vehicle operates smoothly and efficiently. Therefore, it is essential to prioritize this issue to maintain the longevity and reliability of your Volvo S60.

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2012 Volvo S60 Rough Idle Causes & Repair Costs | RepairPal