Toyota Sienna O2 Sensor Emigration
Another sensor is installed in or to the rear of the converter to watchdog its efficiency. Whether the Sienna features two converters, there Testament be four sensors installed on the minivan. One for Everyone manifold and one for Everyone converter.Moulding its debut in 1998, the Toyota Sienna has always featured at least three O2 sensors, due to the profession of its V-engine. A V-engine is shaped adoration a V and has an exhaust manifold on Everyone side. Two upstream O2 sensors recorder the fuel to air ratio before the exhaust hits the catalytic converter.
Finding the Right Sensor
When an O2 sensor fails, it Testament trigger the malfunction indicator glowing (commonly noted as the test engine glassy) on the instrument panel. Either glance at the diagnostic anxiety decree (DTC) with a glance at belongings or obtain it scrutinize at a native Car parts store. Most all scanners Testament explain a DTC(s) with a packages and a quantity. This particular difficulty law numeral can either be revealed with a tiny discription by the scanner or may accept to be looked up in a on-board diagnostic trouble code record.
Any code that reveals a "sensor 1" issue Testament instruct it is one of the upstream sensors near the manifold. "Sensor 2" codes Testament avow the difficulty is in the downstream sensor near the converter.
Bank locations are trickier, nevertheless not overly complicated. To place "Bank 1, Sensor 1" simply catch where the character one, three and five cylinders are on your Sienna. "Bank 2, Sensor 2" would instruct a disagreement with the downstream sensor on the character two, four and six cylinder side of the engine.
Replacing the Sensor(s)
While it's not a damaging conception to moderate all the sensors when one fails, sometimes it's financially burdening. This is where finding the due sensor comes into play. The front and rear sensors are not the duplicate apportionment numbers and are not interchangeable.
To exchange the front sensor(s), lift the front heel or the filled vehicle to buildup access to the undercarriage of the exhaust development. Establish the sensor and disconnect the wire harness. Applicability a dwarf screwdriver to depress the locking plug connexion if necessary.
Next, use a 22mm wrench or an oxygen sensor socket and suitable ratchet. Sometimes on the front sensors, it's difficult to receive one tool or another onto them, so use what works best for you. Spray the threads of the sensor with a copious amount of lubricant spray, such as WD-40 or PB Blaster and allow it to soak in for a few minutes. Use the wrench or ratchet to loosen the sensor by turning it counterclockwise. A box-end wrench would work best because an open-end wrench could mar the hex-head shape of the sensor. Simply insert the detached wire through the box-end of the wrench before applying it to the hex-head. The oxygen sensor socket uses a slit down the side of the socket that accommodates the wire. Once the sensor is loose enough, finish removing it by hand.
The rear sensors are easier to access than the actual sensor, but Toyota places the plug connection under the carpet beneath the front seats. This requires opening the door and then removing the bottom door trim panel with a screwdriver. Set aside and reach underneath the carpet and towards the floorboard and then under the seat to obtain the plug. Once disconnected there, return to the undercarriage and simply pull the rubber gasket plug out from the floor board of the Sienna. The gasket holds the wire in place and prevents water from getting into the floor of the cab.
Once the wire is released, remove the oxygen sensor as you would have or already did the front ones.
Universal or Direct-Fit
There are two types of replacement sensors. Many companies try to elevate the fact that you'll save you money by purchasing universal sensors. These sensors require eliminating the plug connection on both sides of the wire harness. Next, match the wire colors up (which do not always match to the OEM wire harness) and butt connect. Since the rear sensors of the Sienna plug underneath the front seat and carpet, remove the seat to get enough room to perform this.
Compare the prices of the direct-fit sensors before deciding to save money with the universal. You might even find the direct-fit ones cheaper or a couple bucks more.