- The VSC light is on.
- The Check Engine Light is On.
- low fuel efficiency
- Ineffective performance
It goes without saying that you should perform this maintenance on your Toyota Sienna’s engine when it is cold. We’ll be changing the front oxygen sensor. It’s best to remove the air induction tube in front of your engine compartment in order to access your oxygen sensor harness and unplug it.
The worm clamp leading into the throttle body must first be loosened before removing these two 10mm bolts. Push the entire intake upwards to remove it once the worm clamp and these bolts are unfastened. For our instruction on how to replace your Toyota Sienna’s oxygen sensor, you might not need to remove this intake pipe, although it definitely helps.
You’ll have easier access to the front oxygen sensor harness after moving this intake pipe out of the way. The cabling and harness that are attached to the top of the upper radiator hose must be cut away in order to remove the oxygen sensor.
Reach down and release the release clasp on the oxygen sensor wiring harness. The zip ties holding the 02 sensor wiring to the coolant pipe can now be severed after pulling the two parts apart.
Now use a 02 socket or a 24mm open wrench to remove the front oxygen sensor. Installing your new unit will require removing the front oxygen sensor. This 02 sensor’s Toyota part number is 89467-41040, and it’s frequently mistaken for the air/fuel ratio sensor.
This is not the emissions oxygen sensor that you are looking for. Your ECU requires this upstream primary EFI oxygen sensor to keep the closed loop operating. The following list of interchange part numbers applies to the downstream version of this part’s aftermarket offerings:
Apply a thin coating of anti seize to the primary oxygen sensor’s threads, taking care not to get any on the sensor’s tip. Be careful not to cross-thread the 02 sensor as you carefully screw into your front header.
Clear your OBDII fault codes using a scan tool, and you should be good to go. Do you have any inquiries regarding our instructions on replacing the oxygen sensor in a Toyota Sienna? Drop them off for us below!
In This Article...
Can you change the O2 sensors on your own?
Find the faulty sensor in the first step. In order to identify which individual oxygen sensor has failed and needs to be replaced, attach the OBD II scan tool to the car and check the codes before you start.
Vehicles may feature several oxygen sensors, sometimes on either side of the engine, depending on the engine configuration. You can determine whether sensor has to be replacedthe upstream (top) or downstream (bottom) sensorand on what bank (side) of the engine by reading the fault codes.
Step 2: Lift the car. Lift the car and secure it using jack stands once the problematic sensor has been located. When replacing the oxygen sensor, make careful to lift the vehicle up on the side where you can access it.
Step 3: Unplug the connector for the oxygen sensor. Locate the defective oxygen sensor and unplug the wiring harness connector while the car is lifted.
Removing the oxygen sensor is step four. The oxygen sensor should be loosened and removed using the oxygen sensor socket or the corresponding size open end wrench.
5. Compare the defective oxygen sensor to the new sensor. To guarantee proper fitment, compare your old oxygen sensor with your new one.
Install the replacement oxygen sensor in step six. Install your new oxygen sensor and attach the harness once the fit has been confirmed.
Clear the codes in Step 7. The moment has come to clear the codes after the new sensor has been placed. Clear the codes by connecting the OBD II scan tool to the car.
Start the car at step eight. Start the vehicle by taking out and re-inserting the key after the codes have been cleared. Now that the check engine light is off, the symptoms you were having ought to go away.
Most cars simply need a few tools and a few basic steps to replace an oxygen sensor. But if this isn’t something you feel confident handling on your own, any qualified technician, like one from YourMechanic, can handle it swiftly and easily.
Is it necessary to replace an O2 sensor right away?
Your car’s oxygen sensor needs to be replaced at some point throughout the lifespan of your engine because it was not intended to last indefinitely. Depending on the model of your car, newer oxygen sensors are expected to function well for 60,000 to 90,000 miles.
Is Bank 2 on the right or left side?
Each car has a different version of where Bank 2 is. Depending on the vehicle’s make, model, and driver orientation (left-hand or right-hand drive). To merely state that it is located on the passenger side would be presumptuous (although this is predominantly true for rear-wheel drive). The side of an engine having the cylinder firing orders 2, 4, 6, 8, 10, and 12 is referred to as Bank 2 by definition. The B1S1 (Bank 1 Sensor 1) placement is opposite of this.
You can fairly well pinpoint the position of Bank 2 by locating Cylinder 2. Finding Bank 2 in front-wheel drive cars is more challenging than in rear-wheel drive cars, though. Identifying the “It is crucial to be on the engine’s front side and closest to the crankshaft pulley. While the other “Although the front side of a front-wheel-drive car is typically closer to the glass than the radiator, this arrangement is not always the case.
Can you drive if your O2 sensor is broken?
The too rich combination could clog the catalytic converter if you do that. The catalytic converter will need to burn up the additional fuel that was poured into the cylinders. The converter’s lifespan will be significantly shortened because the extra fuel will make it operate at a higher temperature. If the converter’s ceramic core gets hot enough, it can melt, which would limit airflow and eventually clog the exhaust.
A new catalytic converter costs between 10% and 20% more than a new O2 sensor. Therefore, it is best to replace a defective one right away.
Finally, the answer is that you can drive with a damaged O2 sensor. However, you should replace it right away because failing to do so will result in higher gasoline costs, whether for commuting to work or taking a vacation out of town, as well as a higher cost for a new catalytic converter.
Do You Need A Special Tool To Remove O2 Sensor?
No, to remove the O2 sensor from your car, you don’t require a specific tool like the stripped o2 sensor removal tool. You could easily remove it without a special tool, yet nothing beats utilizing the correct equipment for the job. Here are some common tools you can use to remove the O2 sensor from your car.
Wrench set (for this task, you will need a 22 mm or 7/8-inch size wrench)
What happens if my O2 sensor isn’t fixed?
Oxygen sensors are normally only replaced when they malfunction because they are not among the maintenance components that need to be changed on a regular basis, like oil and air filters.
Because they track the quantity of oxygen in the exhaust and provide that data to the engine computer, which then modifies the air-to-fuel ratio, oxygen sensors are a crucial part of the fuel and emissions systems. The engine computer won’t be able to properly establish the air-fuel ratio if an oxygen sensor malfunctions, which could lead to increased emissions, decreased fuel economy, and damage to other parts like an overheated catalytic converter.
We are not aware of any vehicle that has an oxygen sensor failure warning light. As a result, you must rely on other crucial symptoms, such as increased fuel consumption and the check engine light on the dashboard, to inform you when an oxygen sensor needs to be replaced.
O2 sensors’ lifetime is measured in miles.
In the exhaust system of your car, the oxygen sensor goes unnoticed as a hero. In order to ensure that your vehicle’s fuel metering and delivery are accurate and the timing is perfect, it checks the oxygen levels in the exhaust to make sure they are not off. If you have an older vehicle, oxygen (O2) sensors typically last between 30,000 and 50,000 kilometers. The lifespan of newer sensors is 100,000 miles before they require replacement. Below, University Auto Repair offers six indicators that the oxygen sensor in your car is failing.
Is it pricey to repair an O2 sensor?
Taxes, fees, and your specific make and model are not taken into account in this price range, which is based on national averages for all automobiles. There can also be a requirement for related repairs or maintenance. Use RepairPal’s Fair Price Estimator for a more precise quote based on your make, model, and location.
Which side is sensor 2 in bank 2?
Bank 1 The first sensor, which is closest to the engine, is Sensor 1. On Bank 1 denotes that the cylinders 1, 3, 5, 7, etc. are on the engine side.
The second sensor on the engine’s exhaust pipe, often located after the catalytic converter, is known as Bank 1 Sensor 2. On Bank 1 denotes that the cylinders 1, 3, 5, 7, etc. are on the engine side.
The first sensor nearest to the engine is Bank 2 Sensor 1. On Bank 2 denotes that the cylinders 2, 4, 6, 8, etc. are on the engine side.
The second sensor on the engine’s exhaust pipe, often located after the catalytic converter, is known as Bank 2 Sensor 2. On Bank 2 denotes that the cylinders 2, 4, 6, 8, etc. are on the engine side.
How is P0158 code fixed?
What fixes may the P0158 code be fixed with?
- Replace the oxygen sensor at the back.
- Any exposed, damaged, or shorted oxygen sensor wires should be fixed.
- Fix any issues that need to be fixed to reduce the high fuel pressure.
- If necessary, replace the engine coolant temperature sensor.
What leads to the failure of an oxygen sensor?
What Leads to the Failure of an Oxygen Sensor? O2 sensors can malfunction as a result of contamination from things like coolant and oil ash. O2 sensors can occasionally stop working for no apparent reason. Other times, contaminants like oil waste and coolant can cause an O2 sensor to malfunction.
O2 sensor: Can fuel injector cleaning help?
The simple answer is that B-12 Chemtool Total Fuel System Clean-Up (part #2616), our strongest gasoline fuel additive, and a thorough tune-up might help you out.
True oxygen sensor cleansers that are secure to run through your engine don’t exist. We do not advise trying to clean O2 sensors, even if some users choose to remove them and use a wire brush or an aerosol cleaner to remove deposits.
We believe their function is too important to risk the sensors being harmed and inadvertently (and mistakenly) changing the air-fuel ratio. The threads on the sensor(s) might not be able to withstand repeated removal and installation cycles. They occasionally don’t even make it through an entire cycle!
What About My Catalytic Converter?
You cannot directly clean a catalytic converter while it is still attached to the vehicle because anything that may be safely put through the engine will be transformed to CO2, O2, and N2, none of which will perform any cleaning. A “catalytic converter cleaner” is therefore gimmicky. You do, however, have a few choices.
Catalytic converters should actually last the lifetime of the vehicle since, under certain circumstances, they “self-clean.” If the “guts” are physically intact and the catalysts only have a slight buildup, you can: