MAF Sensor In Range But Low (GM) / Mass Air Flow Sensor Signal Inconsistent (Ford)
What does P1102 mean?
The P1102 code means the vehicle's onboard diagnostic system has detected: MAF Sensor In Range But Low (GM) / Mass Air Flow Sensor Signal Inconsistent (Ford). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Poor fuel economy
- Engine running rich -- black smoke from exhaust
- Hesitation during acceleration
- Rough idle
Probable Causes (Ranked by Likelihood)
- Dirty or contaminated MAF sensor Very High
- Air leak between MAF sensor and throttle body High
- Faulty MAF sensor Moderate
- Restricted air filter Moderate
- Damaged air intake duct or boot Low
Step-by-Step Diagnostic Procedure
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Clean the MAF sensor with MAF-specific cleaner
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Inspect the air intake duct between the MAF and throttle body for cracks or loose clamps
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Check the air filter for restriction or contamination
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Compare MAF sensor readings to specifications at idle and under load
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Inspect the intake system for any unmetered air leaks
Frequently Asked Questions
Can I drive with code P1102?
You can drive short distances, but fuel economy will be poor and the engine may run rough. Prolonged driving may cause catalytic converter damage if the engine is running excessively rich.
What causes P1102?
The most common cause is a dirty MAF sensor. Oil from aftermarket air filters, dust, or debris can contaminate the sensing element. Air leaks in the intake system after the MAF sensor are also a frequent cause.
Is P1102 expensive to fix?
Usually not. Cleaning the MAF sensor costs under $15 for the cleaner. If the sensor needs replacement, it typically costs $100 to $250 for parts. Air duct repairs are usually inexpensive.