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2005 Saturn Ion Redline Supercharged P0101 Code: Engine Stalls at 80 MPH - How to Fix?

Model: CAR Fault Code: P0101 Posted: 2006-07-05 14:28

I'm experiencing a serious issue with my 2005 Saturn Ion Redline Supercharged, which has 18,500 miles on the odometer. Today, the check engine light came on, and when I accelerated in 5th gear, the vehicle would only reach 80 mph on the highway. After that, it refused to go faster—no matter how much I pressed the gas pedal, the speed remained stuck at 80 mph. I took it to AutoZone, where they diagnosed a P010,

Related fault codes

P0101

Comments (3)

Anonymous 2006-07-05 16:57

If your vehicle is still under warranty, consider having the dealer address the issue—this can save you money and ensure proper diagnosis. If not, the most likely culprit is your Mass Airflow (MAF) sensor. I suspect you're using a K&N air filter; excess oil from such filters can contaminate the MAF sensor's heating elements, leading to inaccurate readings and triggering code P0101. In some cases, cleaning the sensor might resolve it. However, if your car is under warranty, removing the K&N filter assembly could potentially void coverage—after which, have the dealer replace the MAF sensor as part of a factory-approved repair. Good luck, and feel free to update me on progress!

Anonymous 2006-10-07 23:02

Jeff Compton mentioned that K&N filters can cause P0101 due to oil contamination in the MAF sensor. This is accurate—after installing a K&N filter several years ago, I've had no issues until recently. After re-oiling and cleaning the filter, the P0101 code appeared. How difficult is it to replace an MAF sensor? As someone with only beginner-level mechanical knowledge, I'd estimate it's mid-to-high complexity in terms of labor and precision required.

Anonymous 2006-10-08 10:35

Replacing the MAF sensor isn't technically difficult—most mechanics can do it—but costs are often high. The sensor is typically located between the air filter box and the throttle body. Over-oiling a K&N filter is a common mistake, as it introduces oil particles that contaminate both the MAF and sometimes even the Throttle Position Sensor (TPS). I've seen this issue repeatedly in my experience—so I strongly advise against using K&N-style filters if you're concerned about sensor performance.