AutoCodes – Honda – P1166 1996 Honda Civic

P1166 1996 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 1996 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 4,356

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 1996 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 1996 Honda Civic - Air/Fuel Ratio Sensor 1 Heater Circuit Malfunction - AutoCodes.com — P1166 1996 Honda Civic Code - Air/Fuel Ratio Sensor 1 Heater Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P1166 1996 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 1996 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 1996 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 1996 Honda Civic code?

Need more information on how to fix the P1166 1996 Honda Civic code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1166 1996 Honda Civic code diagnosed by a professional: Find a repair shop in your area

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 1996 Honda Civic Code

1. What are the common symptoms of OBDII code P1166 on a 1996 Honda Civic?

The common symptoms of code P1166 include poor fuel economy, rough idling, engine hesitation, and potential stalling.

2. What does the OBDII code P1166 indicate on a 1996 Honda Civic?

Code P1166 indicates a malfunction in the Air/Fuel Ratio Sensor 1 Heater Circuit in a 1996 Honda Civic.

3. What are the possible causes of OBDII code P1166 on a 1996 Honda Civic?

Possible causes of code P1166 include a faulty air/fuel ratio sensor, damaged wiring or connectors in the sensor circuit, or a blown fuse.

4. How can I diagnose the OBDII code P1166 on my 1996 Honda Civic?

You can diagnose code P1166 by checking the air/fuel ratio sensor's wiring and connectors for damage, testing the sensor's heater circuit resistance, and inspecting the fuse related to the sensor.

5. Can I still drive my 1996 Honda Civic with OBDII code P1166?

It is not recommended to drive your 1996 Honda Civic with code P1166, as it can lead to reduced engine performance and potentially cause further damage.

6. How much does it typically cost to repair OBDII code P1166 on a 1996 Honda Civic?

The cost of repairing code P1166 can vary depending on the exact cause, but it typically ranges from $200 to $500, including parts and labor.

7. Can I reset OBDII code P1166 on my 1996 Honda Civic by disconnecting the battery?

While disconnecting the battery can reset the code temporarily, it is not a permanent solution. It is recommended to diagnose and repair the underlying issue causing the code.

8. Is it possible to prevent OBDII code P1166 from appearing on my 1996 Honda Civic?

Regular maintenance, such as checking and replacing the air/fuel ratio sensor as needed, can help prevent code P1166 from appearing on your 1996 Honda Civic.

9. Can a DIY enthusiast repair OBDII code P1166 on a 1996 Honda Civic?

Depending on the skill level and experience, some DIY enthusiasts may be able to repair code P1166 by following a repair manual and using the necessary tools.

10. How long does it typically take to repair OBDII code P1166 on a 1996 Honda Civic?

The repair time for code P1166 can vary based on the exact cause and the repair process involved, but it generally takes a few hours to complete the repair.