Code Definition

P1191 — TPS Signal Intermittent

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

About P1191

P1191 is a manufacturer-specific powertrain diagnostic trouble code recorded for Ford vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

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.

P1191 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

DTC P1191 on these Ford applications is set when the powertrain control module (PCM) detects an intermittent or erratic signal from the throttle position sensor (TPS), as opposed to a steady out of range value. The TPS reports throttle plate angle to the PCM and that data is central to fuel delivery and engine control, so brief dropouts or spikes upset the calculations. The intermittent nature points strongly toward connector and wiring problems that come and go with heat, vibration, or movement rather than an outright sensor failure. When this code is active the driver may notice hesitation, ...

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