Question about 2002 Toyota Sienna

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I have a 2002 Toyota Sienna LE, the check engine light is on and the pwr dr light is also on. My husband replaced the oxygen sensor but the light is still on, any ideas on what to do next

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Have your local autozone do a dino it is free and will tell more as to the right ? to ask.

Posted on Jul 14, 2009

  • lama2 May 22, 2010

    I've good news and bad news possibly.

    Does the Check Engine Light (CEL) come on a lot? You said after you had an 02 sensor installed, the CEL came back on not long after. Same thing happened to me. I thought, no way that part could have failed again already.

    If so, you may have a bad ECU. The 1998-2003 series Sienna had some defective ECUs installed in them when manufactured. Meaning the CEL is triggered by codes for problems that don't really exist.

    The trouble is, they won't replace the bad ECU for free. They want a 4-digit cost to replace.

    Look into it further and go explain this to them in you have serviced at the dealer.

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How to reset check engine light warning


normally to reset a check engine light all you have to do is unhook the battery for a couple of minutes and then hook it back up. if you are having a sensor problem though this check engine light will come back on after you drive the vehicle for more than 3 minutes.

Jan 29, 2013 | 2002 Toyota Sienna

1 Answer

2007 Toyota sienna V6 P2197 code from Autozone diagnostic.


Solved. I have 2008 Sienna with Check Engine and VSC lights on. Scanned codes were P0051 and P2197. Oxygen Sensor Bank 2 Sensor 1 needs to be replaced. You can see this sensor on the right side of the engine when you open up the hood. You need to get an Oxygen Sensor socket (I used Tekton 7/8in 22mm which costs $9) and a wrench extension to reach it. Spraying liquid wrench a few times on the base of the old sensor also helped to loose it. The replacement sensor I used was Denso 234-9049 which costs $85 from eBay. Lights went off after the sensor was replaced. It took me 30 minutes to replace.
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Sep 07, 2012 | 2008 Toyota Sienna

1 Answer

2001 Toyota Sienna CEL displayed code P1150 & P0420 what could be the problem


Mine is a 2001 Sienna LE. I got the P0420 code and the dealer want to replace an engine control computer for $1600. I've found posts that say you can replace your oxygen sensors, which still costs around $100 each. The P0420 seems to be emissions related. When my check engine light comes on, I run the highest grade, no ethanol gas, and usually within a couple of tanks, the light goes off again. The last time it happened about 2 wks ago, I put in the 93 octane no ethanol premium and a can of Seafoam and within a half a tank, the light went out. Your problem might be more serious, and I don't know what the 1150 code is, but so far that's worked for me.

May 17, 2012 | 2001 Toyota Sienna

3 Answers

2002 toyota le 29,780 Miles check light on during driving code p1135


Code p1135 is a code for an Air/Fuel sensor (oxygen sensor). Bank 1 sensor 1. IT comes up when their is a problem with air/fuel mixture in the engine. It would be anything from a blocked air cleaner, faulty or fouled spark plugs to a blocked exhaust pipe/catalytic convertor. I would get these checked out, and if they are all fine the sensor its self or sensor circuit may have failed, requireing replacement. With your low miles, hopefully this maybe covered under warranty if it is the sensor.

Jan 21, 2011 | 2002 Toyota Camry

2 Answers

Where is bank 1 sensor 2 oxygen sensor located?


The bank 1 sensor 2 sensors are always oxygen sensor located behind the cat converters, the A/F ratio sensors are always in front of the cat in the exhaust manifold, the part number for the sensor B1/S2 is 89465-09290 from Toyota. Thanks.Helpmech.


Nov 12, 2010 | 2002 Toyota Sienna

2 Answers

Check engine light on my 2003 sienna, DTC was



Oxygen Sensor Connector locations

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  1. Disconnect the oxygen sensor connector.
  2. Using an ohmmeter, measure the resistance between the terminals +B and HT. Resistance specification: 11 - 16 ohms at 20°C (68°F).
  3. If the resistance is not as specified, replace the sensor.
  4. Reconnect the oxygen sensor connector.

Oxygen Sensor testing

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I really hope helped with this. Remember rated this help, good luck.

Nov 30, 2009 | 2003 Toyota Sienna

2 Answers

How to repair po420 code on a 2002 toyota sienna


The P0420 code is Catalyst System Efficiency Below Threshold (Bank 1) error.
A code P0420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Some suggested steps for troubleshooting a P0420 code include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter
One thing to note is that many vehicle manufacturers
offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.


Oct 26, 2009 | 2002 Toyota Sienna

1 Answer

98 Toyota Sienna will "bog down" and get sluggish during acceleration. Idles fine and usually runs well when cold. Not fuel system or transmission-already checked by mechanics. Could it be the 02 sensor?


If you had an Oxygen Sensor issue, you would have the check engine light on at your dash. Have your guy hook up a scan tool to the car, and see if there are any codes stored.

Jul 17, 2009 | 1998 Toyota Sienna

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