P0105
Fix within a few daysYour engine computer isn't getting the correct signal from the Manifold Absolute Pressure (MAP) sensor.
Code P0105 means your engine computer isn't getting the right signal from the MAP sensor. Common causes: Faulty MAP sensor (70%), vacuum leak (15%), wiring issues (10%). Drivability: Yes, safe to drive, but expect reduced performance. Repair cost: $30-$150 DIY, $100-$300 professional.
Can I Drive With P0105?
Yes, safe to drive
No restrictions, but expect reduced performance and fuel economy.
Stop driving immediately if: Engine stalls frequently, significant power loss, or black smoke from the exhaust.
Symptoms of P0105
- 1Rough or erratic idle
- 2Poor acceleration or hesitation
- 3Reduced fuel economy
- 4Engine stalling
- 5Hard starting
- 6Black smoke from the exhaust
Common Causes of P0105
Parts most likely causing this code, ranked by probability
A faulty MAP sensor sends incorrect pressure readings to the engine computer, disrupting fuel delivery and ignition timing.
70% of P0105 cases are fixed by replacing this part
An unmetered air leak in the intake manifold or vacuum lines causes the MAP sensor to read incorrect pressure, leading to engine performance issues.
15% of P0105 cases are fixed by repairing a vacuum leak
Corroded, damaged, or loose wiring prevents the MAP sensor from sending a reliable signal to the engine computer.
10% of P0105 cases are fixed by repairing wiring or connector issues
A rare internal fault in the ECM prevents it from correctly processing the MAP sensor signal.
5% of P0105 cases are fixed by replacing the ECM
Check These First (Before Buying Parts)
- Inspect the MAP sensor's electrical connector for any corrosion, bent pins, or loose connections.
- Check all vacuum hoses connected to the intake manifold for cracks, tears, or disconnections.
How to Diagnose P0105
- 1Visually inspect the MAP sensor and its electrical connector for damage or corrosion.
- 2Check all vacuum lines connected to the intake manifold for cracks, disconnections, or leaks.
- 3Using a multimeter, test the voltage at the MAP sensor connector and the sensor's signal output according to your vehicle's service manual.
- 4If the sensor tests bad or shows inconsistent readings, replace the MAP sensor.
- 5If the sensor and wiring are good, perform a smoke test to definitively locate any vacuum leaks.
P0105 on Popular Vehicles
Ford F-150
2004-2024Ford F-150s frequently experience P0105 due to a failing MAP sensor. The sensor is often located on the intake manifold and is relatively easy to access.
75% fixed by replacing the MAP sensor
Honda Accord
2003-2024On Honda Accords, P0105 can be caused by a faulty MAP sensor or, in some cases, a vacuum leak from a deteriorating intake manifold gasket or PCV system hose.
65% fixed by replacing the MAP sensor
Toyota Camry
2007-2024Toyota Camrys can trigger P0105 from a bad MAP sensor, though it's less common than MAF sensor issues. Always check for loose or corroded electrical connections first.
70% fixed by replacing the MAP sensor
Frequently Asked Questions
What does P0105 mean?
P0105 indicates that the Manifold Absolute Pressure (MAP) sensor circuit has a malfunction, meaning the engine computer is receiving an unexpected signal from the sensor.
Can I drive with P0105?
Yes, you can drive safely with P0105, but expect reduced engine performance, poor fuel economy, and possibly a rough idle. Fix this within a few days to prevent further issues.
Will P0105 clear itself?
No, P0105 will not clear itself. The underlying issue causing the incorrect MAP sensor signal must be diagnosed and repaired before the code will clear. You will need to clear it with a scan tool after the repair.
How do I fix P0105 myself?
Start by inspecting the MAP sensor wiring and vacuum lines for damage. If those are good, test the MAP sensor with a multimeter. If the sensor is faulty, replacing it is a straightforward DIY repair.
How much does it cost to fix P0105?
A DIY fix for P0105 typically costs $30-$150 for a new MAP sensor. Professional repair at a shop costs $100-$300, including parts and labor.
P0105 keeps coming back - why?
If P0105 keeps returning, you likely have an undiagnosed vacuum leak, a persistent wiring issue, or a rare ECM problem. Re-check all vacuum lines thoroughly and verify the MAP sensor's electrical connections.
Will P0105 fail emissions/smog test?
Yes, P0105 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on automatically fails the test, and the code indicates an issue affecting engine efficiency and emissions.
What's the difference between P0105 and P0106?
P0105 indicates a general circuit malfunction for the MAP sensor, meaning the signal is out of expected range. P0106 specifically means the MAP sensor's performance is out of range, suggesting the sensor is sending plausible but incorrect readings for engine conditions.
P0105 on Ford F-150?
On Ford F-150s, P0105 is most commonly caused by a failing MAP sensor itself. It's a common wear item. Less often, it can be related to vacuum leaks from aged intake manifold gaskets or cracked vacuum lines.
Questions to Ask Your Mechanic
Did you test the MAP sensor's voltage and signal output with a multimeter or scan tool?
Good answer: Yes, I checked the reference voltage, ground, and signal wire. The signal was erratic/out of spec, indicating a bad sensor.
Did you check for vacuum leaks using a smoke machine?
Good answer: Yes, I performed a smoke test and found a leak at the intake manifold gasket/a cracked vacuum hose.
Repair Cost Estimate
DIY Repair
Parts only
$30-$150
Shop Repair
Parts + labor
$100-$300
Save $70-$150 by doing it yourself
Difficulty
beginner
Time
0.5-1 hours
Beginner-friendly - replacing the MAP sensor is typically a simple bolt-on job, and visual inspections are easy.
Cost of Waiting
Ignoring P0105 leads to continued poor fuel economy, reduced engine power, and potential long-term damage from the engine running too rich or too lean. A $50 MAP sensor fix now prevents wasted fuel and potential catalytic converter issues later.
While You're In There...
A dirty air filter can restrict airflow, indirectly affecting engine vacuum and potentially influencing MAP sensor readings. It's a low-cost maintenance item.
A dirty throttle body can affect idle quality and airflow, which the MAP sensor monitors. Cleaning it ensures optimal airflow and sensor accuracy.
Tools You'll Need
- Basic socket/wrench set
- Screwdriver set
- Multimeter (for testing)
- Scan tool (to clear code)
P0105 is a common sensor code. Most repairs are under $150 and your engine will run much smoother and more efficiently afterward.
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Your Next Steps
Step 1: Visually inspect the MAP sensor's electrical connector and all vacuum lines for any obvious damage or disconnections.
Step 2: If no visual issues are found, use a multimeter to test the MAP sensor's voltage and signal output. Compare readings to your vehicle's specifications.
Step 3: If the sensor tests faulty, replace the MAP sensor. If the sensor is good, perform a smoke test to find any hidden vacuum leaks.