AutoCodes – Toyota – P0159 2007 Toyota Camry

P0159 2007 Toyota Camry Code - Oxygen Sensor Circuit Slow Response Bank 2 Sensor 2

Quick Answer

In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a TWC is used. Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, EFI Relay, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0159 2007 Toyota Camry indicates Oxygen Sensor Circuit Slow Response Bank 2 Sensor 2.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, EFI Relay, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 3,901

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0159 2007 Toyota Camry Description

In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a TWC is used. For the most efficient use of the TWC, the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric air-fuel level. For the purpose of helping the ECM to deliver accurate air-fuel ratio control, a Heated Oxygen (HO2) sensor is used.
The HO2 sensor is located behind the TWC, and detects the oxygen concentration in the exhaust gas. Since the sensor is integrated with the heater that heats the sensing portion, it is possible to detect the oxygen concentration even when the intake air volume is low (the exhaust gas temperature is low). When the air-fuel ratio becomes lean, the oxygen concentration in the exhaust gas is rich. The HO2 sensor informs the ECM that the post-TWC air-fuel ratio is lean (low voltage, i.e. less than 0.45 V). Conversely, when the air-fuel ratio is richer than the stoichiometric air-fuel level, the oxygen concentration in the exhaust gas becomes lean. The HO2 sensor informs the ECM that the post-TWC air-fuel ratio is rich (high voltage, i.e. more than 0.45 V). The HO2 sensor has the property of changing its output voltage drastically when the air-fuel ratio is close to the stoichiometric level.
The ECM uses the supplementary information from the HO2 sensor to determine whether the air-fuel ratio after the TWC is rich or lean, and adjusts the fuel injection time accordingly. Thus, if the HO2 sensor is working improperly due to internal malfunctions, the ECM is unable to compensate for deviations in the primary air-fuel ratio control.

OBDII Code P0159 2007 Toyota Camry - Oxygen Sensor Circuit Slow Response Bank 2 Sensor 2 - AutoCodes.com — P0159 2007 Toyota Camry Code - Oxygen Sensor Circuit Slow Response Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0159 2007 Toyota Camry?

Faulty Rear Heated Oxygen Sensor Bank 2
EFI Relay
Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

How to Fix the DTC P0159 2007 Toyota Camry?

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 does this mean?

Code Tech Notes

Replacing the O2 Sensor 2 usually takes care of the problem

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0159 2007 Toyota Camry 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 P0159 2007 Toyota Camry 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 P0159 2007 Toyota Camry Code

1. What are the common symptoms of OBDII code P0159 on a 2007 Toyota Camry?

- Common symptoms include poor fuel economy, rough idling, and a noticeable decrease in engine performance.

2. What does the Oxygen Sensor Circuit Slow Response Bank 2 Sensor 2 code mean for a 2007 Toyota Camry?

- This code indicates that the oxygen sensor located after the catalytic converter on bank 2 is not responding quickly enough to changes in the air-fuel mixture.

3. What are the possible causes of the P0159 code on a 2007 Toyota Camry?

- Possible causes include a faulty oxygen sensor, wiring issues, exhaust leaks, or a malfunctioning catalytic converter.

4. How can I diagnose the Oxygen Sensor Circuit Slow Response Bank 2 Sensor 2 issue on my 2007 Toyota Camry?

- You can use an OBDII scanner to read the code and monitor the oxygen sensor's response time while the engine is running. Checking the sensor's wiring and connections is also recommended.

5. Can I continue driving my 2007 Toyota Camry with the P0159 code present?

- While it may be possible to drive the vehicle with this code, it is not recommended as it can lead to decreased fuel efficiency and potential damage to the catalytic converter over time.

6. How can I repair the Oxygen Sensor Circuit Slow Response Bank 2 Sensor 2 issue on my 2007 Toyota Camry?

- Repairing this issue typically involves replacing the oxygen sensor on bank 2 sensor 2. Ensuring proper wiring connections and addressing any exhaust leaks may also be necessary.

7. Are there any DIY tips for fixing the P0159 code on a 2007 Toyota Camry?

- If you have experience working on vehicles, you may be able to replace the oxygen sensor yourself. However, it is recommended to consult a professional for accurate diagnosis and repair.

8. How much does it cost to fix the Oxygen Sensor Circuit Slow Response Bank 2 Sensor 2 problem on a 2007 Toyota Camry?

- The cost of repairing this issue can vary depending on the cause of the problem and labor rates in your area. Expect to pay for the cost of a new oxygen sensor and potential installation fees.

9. Can resetting the OBDII system clear the P0159 code on a 2007 Toyota Camry?

- Resetting the OBDII system may temporarily clear the code, but it is likely to return if the underlying issue is not addressed. It is best to diagnose and repair the problem to prevent further issues.

10. How often should I check the oxygen sensors on my 2007 Toyota Camry to prevent the P0159 code from occurring?

- It is recommended to periodically inspect and test the oxygen sensors during routine maintenance to catch any potential issues early and prevent the occurrence of codes like P0159.