OBD-II Code · Sensors
P0104
MAF Circuit Intermittent
Severity
medium
Worth booking. It costs fuel, emissions or comfort until it is fixed.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$50–$300
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Intermittent MAF readings.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- CEL comes and goes
- Intermittent stumble
Likely causes
- Loose connectorMost common
- Chafed wiring
- Failing MAF
Read the full diagnostic procedureP0104 is the intermittent version of the MAF circuit codes — the ECM saw an out-of-range signal that came back into range before it could latch a P01…
P0104 is the intermittent version of the MAF circuit codes — the ECM saw an out-of-range signal that came back into range before it could latch a P0102 or P0103, and it has happened often enough to set a code. These are the hardest MAF codes to diagnose because the fault is rarely present when the car is on the lift.
Cheapest-first ladder
- wiggle-test the MAF connector and the harness back to the first body-tie with the engine running and a scan tool watching g/s — any momentary drop to 0 or spike to 80+ g/s confirms the fault zone; inspect the connector for pushed-back terminals (a terminal that looks seated but has retracted 1-2mm into the plastic shell is the classic culprit); check the harness where it crosses any sharp metal edge — valve cover bolt heads, intake manifold ribs, and airbox brackets are the usual chafe points; clean the MAF with CRC MAF cleaner on principle ($10) since intermittent hot-wire signal dropout can mimic a connector fault; if the wiggle test is clean, leave a scan tool recording freeze-frames during the customer's normal drive cycle for 1-3 days.
- Replacing a MAF for P0104 without a wiggle test is the second-most-common misdiagnosis in this family — the sensor is fine and the connector or harness is the actual fault.
Vehicle-specific patterns2004-2010 Ford 5.4L 3V and 6.8L V10 set P0104 from the well-documented MAF harness chafe at the valve cover edge; 2005-2012 Nissan Frontier/Xterra/Pa…
- 2004-2010Ford 5.4L 3V and 6.8L V10 set P0104 from the well-documented MAF harness chafe at the valve cover edge;
- 2005-2012Nissan Frontier/Xterra/Pathfinder 4.0L VQ40 sets P0104 from cracked solder joints on the MAF circuit board that open and close with thermal cycling;
- 2007-2014GM 5.3L sees P0104 from the broken MAF connector locking tab letting the plug walk loose over time;
- 2003-2008Subaru EJ25 (Forester XT, WRX) sees P0104 from intermittent hot-wire dropout as the sensor ages past 100k miles, where cleaning helps temporarily and replacement is the durable fix.
Estimated repair$20 to $400.
Look up another code
P0104 — frequently asked
What does a P0104 code mean?
Intermittent MAF readings.
What causes a P0104 code?
Common causes: Loose connector; Chafed wiring; Failing MAF.
What are the symptoms of a P0104 code?
Typical symptoms: CEL comes and goes; Intermittent stumble.
Is it safe to drive with a P0104 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $50-$300.
How do I diagnose a P0104 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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