AutoFixDB - Free OBD-II diagnostic trouble code lookup. Find causes, symptoms, diagnostic steps and repair solutions.

Overview

OBD‑II code P00E9 refers to a range/performance fault in the Intake Air Temperature (IAT) Sensor 3 circuit on Bank 1, indicating abnormal signal or sensor behavior affecting air metering.

Common Symptoms

Check Engine Light illuminated
Rough idle
Poor fuel economy
Engine hesitation or stumbling
Incorrect air temperature readings on advanced scan tool

Most Common Causes

Faulty Intake Air Temperature (IAT) sensor high

Sensor may be out of specification or degraded, causing incorrect temperature signal to PCM.

Poor electrical connection or wiring fault to IAT sensor medium

Broken, corroded, or loose wires/connectors can cause intermittent or improper signal.

Vacuum leaks affecting intake readings low

Vacuum leaks may indirectly alter intake readings and cause sensor performance issues.

Engine Control Module (ECM) fault low

Uncommon but possible; ECM input circuitry may fail.

Diagnostic Steps

Connect an OBD‑II scanner and confirm P00E9 is active.

Expected: Code P00E9 present with no conflicting sensor codes.

Interpretation: Verifies the specific fault before deeper inspection.
Inspect wiring harness and connector at the Intake Air Temperature Sensor 3.

Expected: No corrosion, broken wires, or loose pins.

Interpretation: If poor connections are found, repair and re‑test.
Measure sensor output voltage/resistance according to manufacturer specs.

Expected: Sensor readings should match expected values for ambient temperature.

Interpretation: Out‑of‑range reading indicates sensor failure.
Check for vacuum leaks or intake air path obstructions.

Expected: Intake system should be sealed without leaks.

Interpretation: Leaks can affect temperature readings; fix any leaks and retest.
If all else is good, consider testing ECM input for sensor circuit.

Expected: ECM should see stable, accurate signal.

Interpretation: Fault at ECM requires advanced diagnosis or replacement.

Repair Solutions

Replace the Intake Air Temperature (IAT) Sensor easy

Estimated Cost: $30 - $150

Typical cost includes sensor part and basic labor for access.

Repair or replace damaged wiring/connectors medium

Estimated Cost: $50 - $300

Costs vary with extent of wiring damage and accessibility.

Fix vacuum leaks or intake obstructions medium

Estimated Cost: $100 - $400

Depending on leak location and repair complexity.

ECM repair or replacement hard

Estimated Cost: $500 - $1500

Only if confirmed faulty after comprehensive diagnostics.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

Assuming only air intake issue instead of checking sensor wiring or connectors first
Misinterpreting other intake temperature related codes as P00E9

Frequently Asked Questions

Can you explain the meaning of P00E9?

The P00E9 code stands for Intake Air Temperature Sensor 3 Circuit Range/Performance (Bank 1). This generally indicates an issue with the Air Intake system.

How serious is the P00E9 code?

With a severity level of medium, potential incorrect air temperature data may lead to poor fuel metering, hesitation, rough idle, or reduced fuel economy.

Common signs of the P00E9 error code

Drivers often report: Check Engine Light illuminated, Rough idle, Poor fuel economy when this code is present.

Common triggers for the P00E9 error

This code is frequently triggered by: Faulty Intake Air Temperature (IAT) sensor, Poor electrical connection or wiring fault to IAT sensor, Vacuum leaks affecting intake readings.

Estimated repair costs for different causes of P00E9

Expect to pay around $150 if the issue is a Replace the Intake Air Temperature (IAT) Sensor, but up to $1500 if the ECM repair or replacement needs replacement.

Does P00E9 affect Ford, Toyota, or Honda?

This is a universal code. You might see P00E9 on Ford, Chevrolet, Toyota, Honda, Nissan, or any other OBD-II vehicle.

P00E9: Intake Air Temperature Sensor 3 Circuit Range/Performance (Bank 1)