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Nissan Altima GXE P0100 Code: Causes, Fixes, and Whether It's Worth Fixing at 110,000 Miles

Model: Nissan Altima GXE Fault Code: P0100 Posted: 2008-09-19 22:04

I own a 2001 Nissan Altima GXE that was purchased in 2005 with 75,000 miles. The vehicle has now reached approximately 110,000 miles. I perform regular oil changes every three months, tire rotations, and wheel balancing. Two months ago, the coolant pump was replaced. Recently, I've noticed the car hesitating slightly during slow turns, followed by the check engine light illuminating. I initially took it to Firestone, which quoted $90 for diagnosis. After visiting Autozone and Advanced Auto (both offer free OBD2 code reading), I received the same error: P0100 — Mass Air Flow (MAF) sensor malfunction. The car has since stalled twice—once at a red light and once while waiting to turn. What could be causing this? Is it likely a faulty MAF sensor, or are there other possible causes? I'm concerned about the cost of repairs: Firestone charges $150–$300 every 3–4 months for routine maintenance, often citing issues that may not be severe. Does fixing the P0100 code justify continuing to use this vehicle? And is it worth switching to a more reliable independent mechanic? Any advice on diagnosing and repairing the P0100 issue in a 2001 Nissan Altima GXE would be greatly appreciated. Source: http://www.obd-codes.com/forums/posting...e=post&f=1

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P0100

Comments (4)

Anonymous 2008-09-21 19:20

Inspect the wiring harness and connections for frayed wires, open circuits, or shorts between the Powertrain Control Module (PCM) and the Mass Air Flow sensor. Use a multimeter to verify that the MAF sensor reads approximately 5 volts with a 5-volt reference signal under normal operating conditions.

Anonymous 2008-09-22 16:27

A dirty or missing engine air filter can significantly affect MAF readings. Even minor contamination may cause inaccurate airflow detection and trigger P0100. Instead of relying on Firestone, consider establishing a relationship with a reputable independent mechanic—especially one experienced in import vehicles. If you take it to Firestone, they will charge $90 for code reading and then recommend replacing the MAF sensor, which could cost an additional $500 including labor and parts.

Anonymous 2008-09-23 21:07

I confirmed this experience—Firestone charged me $90 for diagnosis. The P0100 code was already present when I checked at Autozone and Advanced Auto. After their inspection, they claimed no wiring issues (performed smoke testing and resistance checks), then diagnosed the MAF sensor as faulty. They charged a total of $500, including diagnosis and replacement. If I wanted to keep the original sensor, an additional $75 was required. The car has been running smoothly since the repair. While I continue to use Firestone primarily due to its proximity to my workplace, I now realize that their service pricing may not always reflect actual vehicle needs or quality of work.

Anonymous 2008-09-24 16:33

This experience is typical. If you're considering long-term car maintenance, it's best to transition to a trusted independent repair shop before major issues arise. Don't wait until the vehicle breaks down—proactive care saves money and improves reliability in the long run. Good luck with your repairs!