P1100 — BARO (Barometric Pressure) Sensor Circuit
CAUTIONIs it safe to drive? Drive gently and get it looked at soon — it can worsen or fail inspection.
What P1100 means
This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).
What P1100 means on specific makes
Toyota / Lexus / Scion CAUTION
Fault in the barometric/intake-air pressure sensor circuit the ECM uses to correct for altitude and load. Often integrated with the MAF/MAP sensor assembly.
- Failed MAF/BARO sensor assembly ($80-250)
- Connector/wiring fault
- Vacuum reference issue
Check first: Check the sensor's live data vs known barometric pressure for the area; inspect the connector.
Source: troublecodes.net/toyota, toyotaspace.com
Related codes
P0105P0106