Standard Ignition Manifold Absolute Pressure Sensor P/N:AS91
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Keep fuel and spark calibration on target with the Standard Ignition Manifold Absolute Pressure Sensor (MAP sensor), MPN AS91. It installs as a direct-fit replacement for the 1998-1999 Ford Ranger, the 1999-2003 Ford F-150, and the 2004 Ford F-150 Heritage. A MAP sensor reads the absolute pressure inside the intake manifold and reports that signal to the engine control module, which uses it to estimate air density (load) and adjust fuel delivery and ignition timing accordingly.
What it does:
Manifold pressure sensing: monitors absolute pressure in the intake manifold and converts it to an electrical signal for the engine computer.
Load input: gives the ECM the data it needs to calculate engine load and manage the air-fuel ratio.
Direct-fit replacement: designed to install in place of the original sensor on the listed applications.
Signs this part may need replacing: rough or unstable idle, hesitation, reduced fuel economy, or a MAP-related trouble code. These symptoms can have other causes, so diagnose the fault first; if a failed manifold absolute pressure sensor is the cause, this replaces it.
Interchange: Manufacturer part number AS91.
Frequently Asked Questions
What does this MAP sensor do?
It measures the absolute pressure inside the intake manifold and sends that signal to the engine computer, which uses it to estimate engine load and adjust fuel delivery and ignition timing.
What vehicles does the AS91 fit?
It is a direct-fit replacement for the 1998-1999 Ford Ranger, 1999-2003 Ford F-150, and 2004 Ford F-150 Heritage. Confirm fitment for your vehicle in the Buyer's Guide tab.
What are signs the MAP sensor may need replacing?
Common signs include rough or unstable idle, hesitation, reduced fuel economy, or a MAP-related trouble code. These can have other causes, so diagnose the fault before replacing.
Will replacing this sensor fix a check engine light?
If a failed manifold absolute pressure sensor is the cause, replacing it addresses that fault. Confirm the diagnosis first, since a check engine light can be triggered by other components.
What is the manufacturer part number?
This is Standard Ignition manufacturer part number AS91, a Manifold Absolute Pressure Sensor.
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Standard Ignition Manifold Absolute Pressure Sensor P/N:AS91
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WARNING:
These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
www.P65Warnings.ca.gov.
