AutoCodes – Honda – P1166 1997 Honda Civic

P1166 1997 Honda Civic Code - Air/Fuel Ratio Sensor 1 Heater Circuit Malfunction

Quick Answer

The Air/Fuel Ratio (A/F) sensor 1 is installed in the exhaust system and detects oxygen content in the exhaust gas. Common causes include Faulty Air/Fuel Ratio Sensor 1, Air/Fuel Ratio Sensor 1 harness is open or shorted, Air/Fuel Ratio Sensor 1 circuit poor electrical connection. 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: P1166 1997 Honda Civic indicates Air/Fuel Ratio Sensor 1 Heater Circuit Malfunction.
Common causes: Common causes include Faulty Air/Fuel Ratio Sensor 1, Air/Fuel Ratio Sensor 1 harness is open or shorted, Air/Fuel Ratio Sensor 1 circuit poor electrical connection.
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 4,262

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 04, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1166 1997 Honda Civic Description

The Air/Fuel Ratio (A/F) sensor 1 is installed in the exhaust system and detects oxygen content in the exhaust gas. The A/F sensor transmits output voltage to the Engine Control Module (ECM). A heater for the sensor element is embedded in the A/F sensor (sensor 1). It is activated and heats the sensor to stabilize and speed the detection of oxygen content by controlling current flowing through the heater. An increase in the current levels off as the applied voltage to the element electrode reaches a certain range because the amount of oxygen which is led through the diffusion layer is limited. The current amperage is proportional to oxygen content in the exhaust gas, so the air/fuel ratio is detected by the measurement of the current amperage. The ECM compares a set target air/fuel ratio with the detected air/fuel ratio and controls the fuel injection timing.
If the A/F sensor (sensor 1) voltage is low, the air/fuel ratio is lean, and the ECM uses A/F feedback control to issue a Rich command. If the A/F sensor (sensor 1) voltage is high, the air/fuel ratio is rich, and the ECM uses A/F feedback control to issue a Lean command.

OBDII Code P1166 1997 Honda Civic - Air/Fuel Ratio Sensor 1 Heater Circuit Malfunction - AutoCodes.com — P1166 1997 Honda Civic Code - Air/Fuel Ratio Sensor 1 Heater Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P1166 1997 Honda Civic?

Faulty Air/Fuel Ratio Sensor 1
Air/Fuel Ratio Sensor 1 harness is open or shorted
Air/Fuel Ratio Sensor 1 circuit poor electrical connection

How to Fix the DTC P1166 1997 Honda Civic?

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 P1166 1997 Honda Civic 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.

Need more information about the P1166 1997 Honda Civic 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 P1166 1997 Honda Civic Code

1. What are the common symptoms of OBDII code P1166 in a 1997 Honda Civic?

- Common symptoms include poor fuel economy, rough idling, engine hesitation, and an illuminated check engine light.

2. What does the OBDII code P1166 on a 1997 Honda Civic indicate?

- The code P1166 indicates a malfunction in the Air/Fuel Ratio Sensor 1 Heater Circuit.

3. What are the possible causes of the Air/Fuel Ratio Sensor 1 Heater Circuit malfunction in a 1997 Honda Civic?

- Possible causes include a faulty air/fuel ratio sensor, damaged wiring or connectors, a blown fuse, or a problem with the sensor's heater circuit.

4. How can I diagnose the issue causing OBDII code P1166 in my 1997 Honda Civic?

- You can diagnose the issue by checking the sensor's wiring and connectors for damage, testing the sensor's resistance, and inspecting the fuse related to the sensor heater circuit.

5. How can I repair the Air/Fuel Ratio Sensor 1 Heater Circuit malfunction in my 1997 Honda Civic?

- Repair options include replacing the faulty air/fuel ratio sensor, repairing damaged wiring or connectors, and ensuring the heater circuit is functioning properly.

6. Can driving with OBDII code P1166 in a 1997 Honda Civic cause further damage?

- Continuing to drive with this code may lead to decreased fuel efficiency, engine performance issues, and potential damage to the catalytic converter.

7. How much does it typically cost to repair OBDII code P1166 in a 1997 Honda Civic?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $200 to $500, including parts and labor.

8. Is it safe to continue driving my 1997 Honda Civic with the check engine light on due to code P1166?

- It is generally not recommended to drive with the check engine light on, as it indicates a potential issue that should be addressed to prevent further damage or performance issues.

9. Can I reset the OBDII code P1166 in my 1997 Honda Civic by disconnecting the battery?

- While disconnecting the battery may temporarily clear the code, it is not a recommended long-term solution. It is best to diagnose and repair the underlying issue causing the code.

10. How often should I replace the air/fuel ratio sensor in my 1997 Honda Civic to prevent OBDII code P1166 from recurring?

- The air/fuel ratio sensor typically lasts around 100,000 miles, but it is recommended to follow the manufacturer's maintenance schedule for optimal performance and to prevent recurrence of the code.