What does P1303 mean on a Ford?

P1303. EGR Calibration Fault. Applies to F-150, Ranger, Explorer, Taurus with EGR monitoring.

What causes P1303 on a Ford?

Lost EGR flow adaptation Carbon buildup shifting flow from calibrated values Recent EGR service without a relearn Failing DPFE sensor skewing calibration Vacuum fault altering EGR flow

How do I fix P1303 on a Ford?

Clean EGR passages and valve Verify DPFE sensor accuracy Run the EGR relearn where applicable Check vacuum supply Confirm flow returns to calibrated range

Code

P1303

EGR Calibration Fault

Category: Powertrain - Auxiliary Emissions Controls
Severity: Check Engine Light
Applies to: F-150, Ranger, Explorer, Taurus with EGR monitoring
Related: P0401 Exhaust Gas Recirculation Flow Insufficient Detected on OBD Codes List

Findings, check these first

Lost EGR flow adaptation
Carbon buildup shifting flow from calibrated values
Recent EGR service without a relearn
Failing DPFE sensor skewing calibration
Vacuum fault altering EGR flow

Standard procedure

Clean EGR passages and valve
Verify DPFE sensor accuracy
Run the EGR relearn where applicable
Check vacuum supply
Confirm flow returns to calibrated range

Code lookup

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Sources and review

Review: qualified. Read the source limits below.

OBDII.pro: P1303 Ford definition
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Supports: Ford-family meaning for P1303: EGR Calibration Fault
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Last updated 2026-09-05.

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