AutoCodes – Lincoln – P1290 Lincoln

P1290 Lincoln Code - Cylinder Head Temperature Sensor Signal Less Than Self-Test Range

Quick Answer

The Cylinder Head Temperature (CHT) Sensor is mounted into the wall of the cylinder head and is not connected to any coolant passages. Common causes include Wrong thermostat, Engine overheated, Low engine coolant level. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1290 Lincoln indicates Cylinder Head Temperature Sensor Signal Less Than Self-Test Range.
Common causes: Common causes include Wrong thermostat, Engine overheated, Low engine coolant level.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 4,017

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 07, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1290 Lincoln Description

The Cylinder Head Temperature (CHT) Sensor is mounted into the wall of the cylinder head and is not connected to any coolant passages. The CHT sends a signal to the Powertrain Control Module (PCM) indicating the cylinder head temperature. If the temperature exceeds 126°C (-258°F), the PCM disables four fuel injectors at a time. The PCM will alternate which four injectors are disabled every 32 engine cycles. The four cylinders that are not being fuel injected act as air pumps to aid in cooling the engine. If the temperature exceeds 154 °C (310°F), the PCM disables all of the fuel injectors until the engine temperature drops below 154°C (310°F).

OBDII Code P1290 Lincoln - Cylinder Head Temperature Sensor Signal Less Than Self-Test Range - AutoCodes.com — P1290 Lincoln Code - Cylinder Head Temperature Sensor Signal Less Than Self-Test Range

What does this mean?

What are the Possible Causes of the DTC P1290 Lincoln?

Wrong thermostat
Engine overheated
Low engine coolant level
Faulty Cylinder Head Temperature (CHT) sensor
Cylinder Head Temperature (CHT) sensor harness is open or shorted
Cylinder Head Temperature (CHT) sensor circuit poor electrical connection

How to Fix the DTC P1290 Lincoln?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1290 Lincoln code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1290 Lincoln Code

What does the OBDII code P1290 mean on a Lincoln?

P1290 indicates that the Cylinder Head Temperature (CHT) sensor is reporting a signal that is below the acceptable range during a self-test.

What are the common symptoms of a P1290 code on a Lincoln?

Symptoms may include an illuminated check engine light, engine overheating, poor engine performance, or the engine going into "fail-safe" or limp mode.

What causes the P1290 code on a Lincoln?

Common causes include a faulty Cylinder Head Temperature (CHT) sensor, damaged wiring or connectors, a malfunctioning PCM, or overheating due to low coolant levels or a faulty thermostat.

Can I drive my Lincoln with a P1290 code?

Driving with a P1290 code is not recommended, as it may indicate engine overheating, which can cause severe damage if not addressed promptly.

How do I diagnose the P1290 code on my Lincoln?

Start by checking the CHT sensor and its wiring for damage or corrosion. Use a multimeter to test the sensor's resistance and compare it to manufacturer specifications.

How do I fix the P1290 code on my Lincoln?

Repairs may include replacing the faulty CHT sensor, repairing damaged wiring or connectors, topping off or flushing the coolant, or replacing a stuck thermostat.

What tools do I need to fix the P1290 code on my Lincoln?

You'll typically need an OBDII scanner, a multimeter, basic hand tools, and possibly a coolant system pressure tester.

How much does it cost to fix the P1290 code on a Lincoln?

Costs vary, but replacing the CHT sensor typically ranges from $100 to $300, including parts and labor. Other repairs, like thermostat replacement or wiring repairs, may cost more.

Can a P1290 code cause engine damage?

Yes, if the P1290 code is due to engine overheating and it's not addressed, it can lead to severe damage such as a blown head gasket or warped cylinder head.

Is resetting the P1290 code enough to fix the issue?

No, simply clearing the code won't fix the underlying problem. Proper diagnosis and repairs are necessary to prevent the code from returning and to protect the engine.