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P0107 usually means a circuit problem, not always a bad sensor. Check the MAP sensor wiring before buying a new sensor. An open circuit (broken wire) or missing 5V reference will cause a low-input code regardless of sensor condition. See top-rated scanners on Amazon ↗
🗺️ Where Is the Problem?
Blueprint view - P0107 MAP sensor low voltage (circuit or sensor fault)
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0107 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
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🎯 Top Causes & Probability
45%
#1 - Most Likely
Open Circuit / Broken Wiring
A broken wire in the MAP sensor signal or ground circuit causes the PCM to see near-zero voltage. This reads as an extremely high vacuum (low pressure). Inspect the harness from sensor to PCM for damage, especially near heat sources and sharp edges.
🔩 Part
$5–$30
👨🔧 Labor
$50–$150
⚡ DIY Difficulty
Medium
35%
#2 - Check First
Failed MAP Sensor (Low Output)
The sensor itself has failed internally and is outputting a low-voltage signal. Usually caused by contamination or a failed internal element. Replace the sensor after ruling out wiring faults.
🔩 Part
$30–$100
👨🔧 Labor
$30–$80
⚡ DIY Difficulty
Easy
12%
#3 - Less Common
Vacuum Leak Creating Low Vacuum
A large vacuum leak can create a constant low-vacuum condition that looks like a low MAP reading. Check the intake manifold, throttle body gasket, and all vacuum hoses.
🔩 Part
$2–$40
👨🔧 Labor
$30–$100
⚡ DIY Difficulty
Easy
8%
#4 -
Vacuum Blockage at MAP Port
A plugged vacuum line to the MAP sensor prevents it from sensing any manifold pressure, resulting in a low or zero output. Disconnect and blow through the vacuum line to check for blockage.
🔩 Part
$0
👨🔧 Labor
$20–$40
⚡ DIY Difficulty
Easy
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Check Reference Voltage at Sensor - Backprobe the MAP sensor connector with KOEO. There should be 5V on the reference wire and 0V on the ground wire. No 5V means the PCM or wiring is faulty, not the sensor.
- Inspect MAP Sensor Wiring Harness - Trace the wiring from the MAP sensor to the PCM. Look for chafed insulation, broken wires, and corroded connectors. Repair any damage found.
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need