P0142 Toyota Code - HO2S13 Circuit Fault
Quick Answer
The rear heated oxygen sensor (or sensor 3 for some vehicles), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Faulty Heated Oxygen Sensor Bank 1 Sensor 3, Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection. 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
- P0142 Toyota indicates HO2S13 Circuit Fault.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor Bank 1 Sensor 3, Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection.
- 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 P0142 Toyota Description
This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 3 is not used for engine control operation.
What are the Possible Causes of the DTC P0142 Toyota?
- Faulty Heated Oxygen Sensor Bank 1 Sensor 3
- Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted
- Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection
How to Fix the DTC P0142 Toyota?
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 P0142 Toyota 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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Frequently Asked Questions about P0142 Toyota Code
1. What does the OBDII code P0142 mean for a Toyota?
P0142 indicates a fault in the circuit of the third heated oxygen sensor (HO2S13), which monitors exhaust gases after the catalytic converter.
2. What are the common symptoms of code P0142 on a Toyota?
Symptoms include a lit check engine light, decreased fuel efficiency, rough idling, and potential engine performance issues.
3. What causes the P0142 code to appear in a Toyota?
Common causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or a malfunctioning powertrain control module (PCM).
4. How do I diagnose the P0142 code on my Toyota?
Inspect the HO2S13 sensor, check for damaged wiring or connectors, and use a multimeter to test the sensor's voltage and resistance.
5. Can a bad catalytic converter trigger the P0142 code?
Yes, a failing catalytic converter can impact the performance of downstream oxygen sensors and trigger this code.
6. How do I fix the P0142 code on a Toyota?
Repairs may include replacing the faulty oxygen sensor, repairing damaged wiring, fixing exhaust leaks, or updating/replacing the PCM.
7. Can I drive my Toyota with the P0142 code?
Driving with this code is possible but not recommended, as it can lead to reduced fuel efficiency and potential damage to the catalytic converter.
8. How much does it cost to fix the P0142 code on a Toyota?
Costs vary but typically range from $150 to $400, depending on whether the oxygen sensor, wiring, or other components need replacement.
9. Is the P0142 code specific to Toyotas?
No, while it can appear on Toyota vehicles, P0142 is a generic OBDII code that can occur in other makes and models.
10. Can cleaning the oxygen sensor resolve the P0142 code?
Cleaning an oxygen sensor is not generally effective. If the sensor is faulty, it’s best to replace it.
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