Code Definition

P1100 — BARO Sensor Circuit

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Lexus

About P1100

P1100 is a manufacturer-specific powertrain diagnostic trouble code recorded for Lexus vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1100 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1100 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

In Lexus vehicles, the P1100 fault code is specific to the Barometric Pressure Sensor Circuit. This code is set when the Engine Control Module (ECM) detects a malfunction or irregular signal in the barometric pressure sensor circuit. The barometric pressure sensor plays a critical role in engine management, as it measures the atmospheric pressure and aids the ECM in adjusting the air/fuel mixture and ignition timing for optimal engine performance.

Quick Facts