P0159 2009 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 2009 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.
Code P0159 2009 Toyota Camry Description
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.
What are the Possible Causes of the DTC P0159 2009 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 2009 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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0159 2009 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 2009 Toyota Camry code?
Need more information on how to fix the P0159 2009 Toyota Camry code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0159 2009 Toyota Camry code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0159 2009 Toyota Camry Code
1. What are the common symptoms of OBDII code P0159 in a 2009 Toyota Camry?
- Common symptoms include decreased fuel efficiency, rough idling, and the illumination of the Check Engine Light.
2. What does the OBDII code P0159 for a 2009 Toyota Camry indicate?
- This code indicates a slow response from the oxygen sensor located in Bank 2 Sensor 2 of the vehicle's exhaust system.
3. What are the possible causes of OBDII code P0159 in a 2009 Toyota Camry?
- Possible causes include a faulty oxygen sensor, wiring issues, exhaust system leaks, or a malfunctioning engine control module.
4. How can I diagnose the OBDII code P0159 in my 2009 Toyota Camry?
- Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the oxygen sensor and related wiring, and checking for any exhaust leaks.
5. Can I continue driving my 2009 Toyota Camry with OBDII code P0159?
- It is not recommended to ignore this code, as it can lead to decreased fuel efficiency and potential long-term damage to the vehicle's engine.
6. How can I repair OBDII code P0159 in my 2009 Toyota Camry?
- Repair options may include replacing the oxygen sensor in Bank 2 Sensor 2, repairing any wiring issues, fixing exhaust leaks, or resetting the engine control module.
7. Will resetting the Check Engine Light resolve OBDII code P0159 in my 2009 Toyota Camry?
- Resetting the light may temporarily turn it off, but it will not fix the underlying issue causing the code to trigger. Proper diagnosis and repairs are necessary.
8. Are there any DIY tips for addressing OBDII code P0159 in a 2009 Toyota Camry?
- DIY enthusiasts can start by checking the oxygen sensor connections, inspecting the wiring for any damage, and ensuring the sensor is receiving proper voltage.
9. How much does it typically cost to repair OBDII code P0159 in a 2009 Toyota Camry?
- The cost of repair can vary depending on the exact issue, but it may range from $100 to $300 for parts and labor, excluding any additional repairs that may be needed.
10. Can a bad oxygen sensor cause other issues in a 2009 Toyota Camry besides triggering OBDII code P0159?
- Yes, a faulty oxygen sensor can lead to poor engine performance, increased emissions, and potential damage to the catalytic converter over time.
Discuss the causes and fixes for P0159 2009 Toyota Camry OBDII Code
Code P0159 2009 Toyota Camry comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
