OBD-II Fault Code

P1104: MAF Ground Malfunction

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for P1104.

System family

Powertrain

Manufacturer-specific

Repair category

Air metering

Use this category to narrow your checks before replacing parts.

Severity

Medium

Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.

What P1104 usually means

MAF Ground Malfunction.

Common symptoms

Check Engine light; Poor drivability or reduced fuel economy depending on fault

Likely causes

Dirty MAF sensor; Intake leak; Wiring fault; Aftermarket air filter contamination

Diagnostic checks

Scan all modules and record freeze-frame data before clearing codes; Check battery voltage and related fuses; Inspect intake ducting after MAF; Compare MAF grams/sec to expected range; Check connector pins

Repair guidance

Clean MAF using proper MAF cleaner or replace if readings/wiring tests fail; Repair intake leaks

Verification after repair

Clear code, road-test through the same drive condition, then rescan

Note: Confirm vehicle make/model/year because manufacturer-specific codes can vary; Manufacturer-specific: confirm definition and test steps in the vehicle service manual. A DTC identifies a circuit or system condition, not always the failed part.