AA Ignition Mass Air Flow Sensor (MAF) for GM 1999–2009 — Direct-Fit Hot-Wire, Plug-and-Play, Lifetime Warranty

The AA Ignition Mass Air Flow Sensor (MAF) is a direct-fit replacement that measures incoming air to restore proper fuel delivery and resolve MAF-related drivability issues for many GM and allied vehicles from 1999–2009.

If your engine has a check engine light pinpointing a MAF fault code (P0100–P0103), rough idle, hesitation, stalling, or sudden drops in fuel economy, a failed or contaminated mass air flow sensor is a common cause. This AA Ignition sensor is designed as a plug-and-play replacement for numerous Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Oldsmobile, Pontiac and Saab models; it uses a factory-calibrated hot-wire element to provide accurate airflow readings without modifications.

How will this MAF sensor improve my car’s performance?

Replacing a worn or dirty MAF restores the engine computer’s ability to measure intake air accurately, which improves idle stability, throttle response and fuel metering. Once installed, you should see reduced hesitation and fewer MAF-related diagnostic trouble codes.

• Restores correct air/fuel ratio for smoother idle and acceleration.
• Reduces or eliminates P0100–P0103 fault codes.
• Improves fuel economy lost to inaccurate airflow readings.
• Plug-and-play fit avoids time-consuming wiring or tuning changes.

Is this sensor compatible with my Buick, Cadillac or Chevy?

This AA Ignition unit cross-references common OEM numbers (25168491, 25318411AA, AF10043, 25318411) and fits many models such as Buick Rainier (2004–2007) and Cadillac CTS (2004–2005). Always verify the part number on your original sensor and consult the full compatibility list to ensure an exact match.

• Direct-fit examples: Cadillac DeVille, Eldorado, Escalade, Escalade ESV, Escalade EXT.
• Fits model years spanning late-1990s to 2009 depending on application.
• Cross-references common OEM and aftermarket part numbers for verification.
• Check your vehicle’s VIN or original part label before ordering.

What makes this AA Ignition MAF a reliable replacement?

Although not an original equipment manufacturer part, this sensor is engineered to meet or exceed factory tolerances and includes a calibrated hot-wire sensing element for accurate measurements. The housing, connector and mounting points are designed for direct exchange with your original sensor to simplify installation.

• Factory-calibrated hot-wire element for consistent airflow readings.
• Durable housing and connector to match OE fitment and finish.
• Plug-and-play installation—no custom wiring or reprogramming required.
• Backed by AA Ignition’s lifetime warranty for long-term value.

How do I install and maintain the new MAF sensor?

Installation is typically a straightforward swap: remove the intake duct, unplug the electrical connector, unbolt the old sensor and replace with the AA Ignition unit. For best results, inspect and replace or clean your air filter when replacing the MAF to prevent premature contamination.

• Tools needed: basic hand tools and a clean work area—no special programming tools.
• Reset engine codes after installation to verify proper operation.
• Replace or clean the air filter to minimize future sensor fouling.
• Contact AA Ignition for warranty support if any issues arise.

Who is this for? This AA Ignition Mass Air Flow Sensor is for DIY mechanics, independent shops and vehicle owners who need an affordable, direct-fit replacement for MAF-related drivability complaints on GM and allied-brand cars and trucks from the 1999–2009 era. If you have a confirmed MAF code, visible sensor contamination, or suspect inaccurate airflow readings from your original sensor, this part provides a cost-effective repair path with a lifetime warranty and OE-style fit.