# Does my Toyota dealership know what they are doing? Re: Oxygen sensor and check engine light

**URL:** <https://community.cartalk.com/t/does-my-toyota-dealership-know-what-they-are-doing-re-oxygen-sensor-and-check-engine-light/64936>\
**Category:** Maintenance/Repairs\
**Created:** [May 24, 2011, 6:29pm UTC](https://community.cartalk.com/t/does-my-toyota-dealership-know-what-they-are-doing-re-oxygen-sensor-and-check-engine-light/64936 "2011-05-24T18:29:06Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\
**Post date:** [May 25, 2011, 3:35am UTC](https://community.cartalk.com/t/does-my-toyota-dealership-know-what-they-are-doing-re-oxygen-sensor-and-check-engine-light/64936/8 "2011-05-25T03:35:07Z")

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Common Problems That Trigger the P0130 and P0136 Code

```
Defective Oxygen Sensor/Air Fuel Ratio Sensor
Defective Oxygen Sensor/Air Fuel Ratio Sensor Heater circuit
Exhaust System Leak
Intake Air System leak (including vacuum leaks)
Low Fuel Pressure
Defective Engine Coolant Temperature Sensor
Defective sensor wiring and/or circuit problem
PCM software needs to be updated
Defective PCM

```

Common Problems That Trigger the P0150 Code

```
Defective Oxygen Sensor
Faulty Oxygen Sensor wiring or connections
Defective operation of the Fuel System

```

Common Misdiagnoses

```
Oxygen Sensor Sensor is replaced when the problem is a lean-running fuel system
Oxygen Sensor is replaced when the problem is faulty Oxygen Sensor wiring or connections
Oxygen Sensor is replaced when the problem is a vacuum leak or defective Mass Air Flow Sensor

```

Common Problems That Trigger the P0153 Code

```
Defective Oxygen Sensor
Faulty Oxygen Sensor wiring or connections
Exhaust System Leak(s)

```

Common Misdiagnoses

```
Oxygen Sensor is replaced when the problem is faulty Oxygen Sensor wiring or connections
Oxygen Sensor is replaced when the problem is a vacuum leak or defective Mass Air Flow Sensor
```

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_[View the full topic](https://community.cartalk.com/t/does-my-toyota-dealership-know-what-they-are-doing-re-oxygen-sensor-and-check-engine-light/64936)._