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Other Useful Sienna Pages.
For help with Toyota Door Handle replacement
For help with Toyota Sienna Knock Sensors click here
For help with Toyota Sienna Oxygen Sensors click here.
For help with Toyota Sienna Misfire Codes click here.
Read the Story of our Toyota Sludged Engine Repair.
For help programming your remote door lock fob / keyfob
2001 Toyota Sienna P0420
P0430 Oxygen Sensor - A/F Sensor Malfunctions - Help!
CHECK ENGINE LIGHT ON!
Replacing the Oxygen Sensors on a Toyota Sienna Van - 2001
1/26/06 1MZ-FE V6
The P0420 & P0430 DTC Error codes seemed to suggest that the catalytic converters were bad, but instead the oxygen sensors were the problem. And, of course, being heated ones, they cost over $100 each. What happens is, the deteriorating sensors make the computer (ECM) increase the richness of the mixture to a point that the converters cannot work well. Here we go again. I knew this was going to cost some money from the start. OK, so someone pointed out that the front two sensors (before the CAT) are actually Air/Fuel Ratio sensors.....that and $5 will get you a cup of coffee...they still cost a lot of money.
Words of Warning - You have to get right under the vehicle to do these replacements. Please don't let it fall on you! Jack Stands and other safety measures are recommended. A 3-4 ton van falling on you will ruin your day.
Oxygen/ AF Sensor Part Numbers Toyota Sienna 2001
Bosch Sensor Part Numbers - 2 Near engine are 13540 Rear Oxygen Sensor is 13566
Note: They use different connectors! (Something no one could ever confirm until I pulled them out)
BTW the Denso brand IS better (and the original equipment apparently) but cost even more! Be prepared for 2nd mortgage.
THE "EASY ONE"
Changing the front one is easy... but rear pre-CAT one is mind numbingly difficult! The back one downstream/post-CAT( which IS actually an oxygen sensor) is not too bad to change..
The rear one is easy enough to pull down, but the connector is under the front passenger seat and hard to reach of course.
THIS IS THE TOUGH BIT
The firewall one ( the middle one if you like) is the real challenge. I used all kinds of tools to unscrew it and replace it. Although it is in plain sight, it is completely "boxed in" by the axles and other stuff in a way that is almost funny when you start to try to remove it! One reader suggested using a twelve year old with small hands - I cannot recommend this or see how his/her mother would allow it anyway!
You can reach it from underneath using a long open-ended 22mm wrench but getting the special socket on it (has a slot for the wires - you can buy or rent from parts stores) was next to impossible. Getting the old one out was hard (even disconnecting the connector which involved squeezing the little tab while pulling apart) but putting the new one in using just 2 fingers was exhausting. I am so glad that Pastor Scott was NOT there listening to me while I did this. God, I hope, understands.
PLEASE NOTE: After you replace them (and drink 8 beers) then clear the codes with your scanner (or disconnect battery of course)
(I use a CP9135 by www.Actron.com) you will have to drive a while to reset (make "Ready") the Oxygen and Catalyst Readiness Monitors. (Software flags in the Vans computer ECM)
My "EVAP Readiness Monitor" NEVER did go "Ready" but the State Inspection folks (Texas) know this happens sometimes and make allowances for having no more than 1 of these monitors not set (as long as no other emission DTC codes are present of course). It passed. Check your states rules on this - we wasted 3 weeks worrying about it when we could have had it inspected and passed! Note: Texas changed rules on 2001 and later vehicles to 1 Readiness Monitor in October 2008
Update: August 09 - $325 Charcoal Canister fixed Evap Problem. Yuk (and that was me fixing it! Take it to a dealer at your peril.....)
The lesson? If you are buying a 1999-2006 Toyota Sienna (or many other cars of these years too probably), budget for new sensors and they will be expensive. By the time we finished, we were out $500 and we did the work ourselves. Goodness knows what a garage would charge. Those with heart conditions should not get an estimate.....
You can see the "easy one" sticking out of the front exhaust manifold (look above the "1MZ" in 1MZ-FE)
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