Parts
$20–80
P0106 — MAP Sensor Range / Performance
CAUTIONIs it safe to drive? Usually driveable but expect rough running and poor fuel economy — don't ignore it long-term as it can cause catalyst damage or stalling.
What P0106 means
The manifold absolute pressure sensor is reading vacuum/pressure values that don't match what the throttle position and engine speed would predict. The sensor works but its output doesn't make sense in context.
Most likely causes (in order)
- Vacuum leak between throttle body and intake manifold (check hoses and gaskets first — free to inspect)
- MAP sensor contaminated with oil vapor from PCV system
- Faulty MAP sensor ($20–80 part)
- Wiring issue — chafed, corroded, or loose connector at sensor
- Throttle body dirty or stuck, causing false MAP vs TPS conflict
Symptoms you might notice
- Rough or erratic idle
- Hesitation or stumble on acceleration
- Poor fuel economy
- Engine may surge at cruise
- Hard starting when warm
What to check first
Compare live MAP sensor voltage at idle against spec (typically 1.0–1.5V at idle, 4.5–5V at WOT) using a scan tool; then manually apply vacuum with a hand pump and verify the reading changes linearly — a good sensor tracks vacuum perfectly, a bad one flatlines or jumps.
Repair cost & difficulty
Labor
0.3–0.7 hr
Difficulty
DIY-friendly