AutoCodes – Audi – P1198 Audi

P1198 Audi Code - O2S Heater Circuit Bank 1 Sensor 2 Electrical Malfunction

Quick Answer

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. Common causes include Faulty O2 Sensor, O2 Sensor harness is open or shorted, O2 Sensor 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: P1198 Audi indicates O2S Heater Circuit Bank 1 Sensor 2 Electrical Malfunction.
Common causes: Common causes include Faulty O2 Sensor, O2 Sensor harness is open or shorted, O2 Sensor 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 7,272

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 Jul 10, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1198 Audi Description

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).
In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

OBDII Code P1198 Audi - O2S Heater Circuit Bank 1 Sensor 2 Electrical Malfunction - AutoCodes.com — P1198 Audi Code - O2S Heater Circuit Bank 1 Sensor 2 Electrical Malfunction

What does this mean?

What are the Possible Causes of the DTC P1198 Audi?

Faulty O2 Sensor
O2 Sensor harness is open or shorted
O2 Sensor circuit poor electrical connection

How to Fix the DTC P1198 Audi?

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 P1198 Audi 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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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 P1198 Audi Code

1. What does the OBDII code P1198 mean on an Audi?

P1198 indicates an electrical malfunction in the O2 sensor heater circuit for Bank 1 Sensor 2, which is the downstream oxygen sensor.

2. What are common symptoms of the P1198 code in an Audi?

Symptoms may include a check engine light, reduced fuel efficiency, rough idling, or increased emissions.

3. What causes the P1198 code on an Audi?

Common causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or issues with the vehicle's PCM.

4. Can I drive my Audi with the P1198 code?

While the car may remain drivable, ignoring the code can lead to poor fuel economy and potential damage to the catalytic converter over time.

5. How do I diagnose the P1198 code on my Audi?

Start by inspecting the wiring and connectors for damage, testing the O2 sensor heater circuit with a multimeter, and checking for blown fuses.

6. How do I fix the P1198 code on an Audi?

Repairs may involve replacing the O2 sensor, repairing damaged wiring, or addressing issues with the PCM.

7. How much does it cost to fix the P1198 code on an Audi?

Replacing the O2 sensor typically costs $100-$300, while wiring repairs or PCM issues might vary depending on labor rates and the extent of the damage.

8. Does the P1198 code affect emissions testing?

Yes, the code can cause your Audi to fail emissions tests due to improper functioning of the O2 sensor and increased exhaust emissions.

9. Is the P1198 code specific to Audis?

No, the P1198 code can appear in other vehicles, but its exact meaning and symptoms may vary depending on the make and model.

10. Can a bad catalytic converter cause the P1198 code in an Audi?

No, the P1198 code is related to the heater circuit malfunction in the O2 sensor, not the catalytic converter itself. However, prolonged issues may indirectly harm the converter.