What does P1000 mean on a Ford?

P1000. OBD-II Monitor Testing Incomplete. Applies to All Ford, Lincoln and Mercury OBD-II vehicles (F-150, Explorer, Escape, Focus and others).

What causes P1000 on a Ford?

Battery was recently disconnected or went dead, clearing monitor history Codes were just cleared with a scanner before all drive cycles completed A pending fault keeps interrupting the same monitor before it can finish Vehicle has only been driven on short trips since the last reset

How do I fix P1000 on a Ford?

Do not clear codes again. Every reset restarts all monitors from zero Complete a full Ford drive cycle: cold start, idle, steady cruise, and deceleration Use a scanner to check which specific monitors still read incomplete Fix any underlying fault that prevents a monitor from completing Re-test emissions only after all required monitors show ready

Code

P1000

OBD-II Monitor Testing Incomplete

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: All Ford, Lincoln and Mercury OBD-II vehicles (F-150, Explorer, Escape, Focus and others)
Related: No single generic twin. See OBD Codes List

Findings, check these first

Battery was recently disconnected or went dead, clearing monitor history
Codes were just cleared with a scanner before all drive cycles completed
A pending fault keeps interrupting the same monitor before it can finish
Vehicle has only been driven on short trips since the last reset

Standard procedure

Do not clear codes again. Every reset restarts all monitors from zero
Complete a full Ford drive cycle: cold start, idle, steady cruise, and deceleration
Use a scanner to check which specific monitors still read incomplete
Fix any underlying fault that prevents a monitor from completing
Re-test emissions only after all required monitors show ready

Code lookup

Type a code above, or start from a symptom or a common code.

Press / to jump to the box. Ford-enhanced powertrain, body, chassis and network codes. Generic P0xxx codes live on OBD Codes List.

Sources and review

Review: checked against the recorded source material.

OBDII.pro: P1000 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1000: OBD-II Monitor Testing Incomplete
Fetched directly. obdii.pro is a publisher independent of the engine-codes family.
P1000 FORD Code: Meaning, Causes, and Symptoms | OBD2 Codes
live reference page (obd2-codes.co)
Supports: Ford meaning for P1000: On Board Diagnostic System Readiness Test Not Complete
Fetched directly. obd2-codes.co phrasing matches the engine-codes family, so it counts as one publisher.

Last updated 2026-09-20.

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