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Unread 07-09-2009, 07:15 AM   #1
jacal
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Default 02 Sensor failure throws vsc & abs?

Hey guys...it's been awhile!

So after a brake service and new pads I get a christmas tree: check engine, vsc trac, vsc, and even the ABS orange warning lights!

I was worries that they caused the error when doing the brakes. They scanned and scanned, and claim it's just the o2 sensor (AF sensor bank1 sensor1 code P0504). Do I believe this?

First how crazy is Toyota engineering to let a failed o2 sensor turn off the vsc and abs systems? Where is the connection?

Second, how easy is it for me to replace that o2 sensor - any advice? My mom's Nissan Maxima chews thru o2 sensors like crazy, mind you that car is a 1995. Might as well learn to DIY on this one...I'm pretty sure it's plug and play once I find the right location and free the bolts.

Third, o2 sensor is priced at $332 Cdn !!!! WHAT?? PN 89467-60010 right side. What kind of prices do you guys see Stateside? I feel that 332 is a rip off. (Dealer says $109 Cdn to install i.e. min charge of 1 hour)

I searched but couldn't find an o2 replacement thread.


Thanks,
John.
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Unread 07-13-2009, 06:51 AM   #2
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How to change your O2 sensor:

This is a very easy job. It makes a big difference in MPG. Be careful to get the right part, they may look the same, but the connectors are different.

You are changing this sensor because your check engine light is on, and you have a code in the system. Personally I had "bank 1 sensor 1". I understand this as: bank 1 = bank side where cyclinder 1 is (Right hand side or passenger side of suv). Sensor 1 is before the cat, sensor 2 would be downstream (after cat).

I purchased but did not need the o2 socket. I located the 02 sensor on my passenger side on the engine exhaust manifold. I removed it with a 7/8 (I know, should have been metric). It came off easy. The night and morning before I saturated it with WD-40. Not sure if that is necessary. Unplugging it took forever. You can't see the connector. You must pull and insert a scredriver (towards the firewall side) and once you release the tab while pulling it pops out like butter.

Put in your new sensor. I didn't go very tight. Finger tight, plus maybe a half turn. They have a crush washer so I doubt it will work itself out. Plug it in. I do not have a code reader, so I unplugger the negative terminal for 10 mins to clear the code.

Done! no more check engine light and a big jump in mpg. This was an expensive part, nearly $300 Cdn. I bought the toyota oem (denso) part. It was very very hard to find in my area.

Unfortunately I still have the 2 vsc orange lights...I will need to get re-scanned. However, this goes against the stealers claim that they were because of the check engine light.

To wrap up: this is my experience only, and this information may be flawed.


J
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Unread 07-13-2009, 11:05 AM   #3
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Please keep us updated.
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Unread 07-13-2009, 11:25 AM   #4
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Great info on the O2 sensor.

Yes, keep us updated on the issue with the dealer. brakes and dash lights.

Sounds like they damaged one of your sensor wires, or maybe forgot to reconnect a wire.
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Unread 07-14-2009, 06:25 AM   #5
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Default Wrap-Up

I returned to the stealer, because they offered to clear my codes once I replaced the O2 sensor (nice).

They tried to clear them but no luck. In fact the abs came back with the vsc lights and they started blinking while attached to the toyota computer. Turns out that means they are flashing the error code number. They took a test drive and then did the zero point calibration. Issue resolved!

They asked if the battery was dissconnected and the suv moved...I said no. They claim that can require a ZPC.

So - do I believe the check engine causes the vsc lights? Not really, but I can't be conclusive.

Out of interest, these upstream O2s are pricey, but downstream (after cat) are a bit more reasonable. They are all accessible, upstreams are a little tighter to get at.

If you know the code (and therefore which sensor to swap) this is easy to do. The stealer tried to scare me, telling me how they have had to replace entire manifolds for $2000 because they messed up removing o2 sensors. They also told me how they have had to re-tap the threads MANY MANY times. I doubt it, but it did make me hesitate and not trust myself.

Fuel econ is down to 14.3L/100km in just a few city drives. Pretty decent!

Let me know if there are any other questions and I'll do my best to answer.


J
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Unread 07-14-2009, 09:55 AM   #6
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Where are you in Canada? I'm in North Toronto area.

Dealer prices are high, but when you know how to deal with them, it cheaper.
Most of the work is doible on the driveway, soI barely drive to dealer, only in cases when they have something I don't.

Glad everything is fine now. BTW, Zero Point Calibration is required if you mess up with Stability system or add a big lift. I had to do it once when I put 7", I still need to do one more when I'll finish with my front. Cost $100.
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Unread 07-15-2009, 08:49 AM   #7
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Factory o2 sensors are very expensive. Autozone has BOSH universal 02 sensors from $70.00-$120.00
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Unread 07-16-2009, 01:16 PM   #8
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hi...i work for a Toyota Dealer and yes, whenever the Check Engine light comes on for any reason the system goes into a fail safe mode and dissables the Vsc and trac system....hence those lights come on aswell.

as far as them telling you that sometimes manifolds need to be replaced when replacing o2 sensor....TRUE. occasionally those sensors seize in the manifold and will not come out. generally they come out and rip the threads right out with the sensor and therefore need to be re-tapped but its not uncommon for them to never come out at all and than the manifold needs to be replaced.

feel free to remember my username and if you ever have any questions regarding what the dealer is telling you, id be happy to clarify wether or not its bs. hope this helps.

Rick
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Unread 07-17-2009, 07:49 PM   #9
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I agree with TNTramair, i also work for a toyota dealer and the trac/vsc system will dissable when the check engine light comes on. and yes they can be a pain to get the sensors out, i have had them get stuck to the point where i have had to replace the manifold.

you can also feel free to pm me with any questions and i will try to help out.
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Unread 07-17-2009, 08:50 PM   #10
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Welcome to the forum Rick and Moto. Nice to have a few more tech guys on the forum.
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Unread 07-18-2009, 05:21 AM   #11
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glad to be here.
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Unread 07-18-2009, 06:25 AM   #12
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glad i joined
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Unread 07-28-2009, 09:03 AM   #13
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The lights are back! The 2 vsc and abs come on, not right away, but after some driving.

I notice that the brake pedal - shifter link is a bit touchy lately, not buttery smooth like it used to be. I wonder if the brake-pedal switch is flaking out?

I don't think that this is anything that the dealer did wrong with the pad/brake service...but who knows. Maybe just a few problems in a row that appear to be related but may have happened anyway.

I've replaced brake switches on jettas - trivial job. I'll see if I can get it scanned to be sure.


J
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Unread 07-28-2009, 09:17 AM   #14
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if you can get me a code ill steer you in the right direction.
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Unread 08-14-2009, 09:11 AM   #15
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Out of interest I've had no lights for days! Yay!



J
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Unread 01-25-2010, 10:48 PM   #16
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I'm having the same Maint/ABS/trac/vsc/Brake lights problem. I disconnected the battery and the lights went off for about 10 minutes but came right back on. So damn frustrating.

Last edited by vra94tt; 01-25-2010 at 10:55 PM.
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Unread 01-26-2010, 07:55 AM   #17
jacal
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Quote:
Originally Posted by vra94tt View Post
I'm having the same Maint/ABS/trac/vsc/Brake lights problem. I disconnected the battery and the lights went off for about 10 minutes but came right back on. So damn frustrating.
In addition to this thread, did you check:
http://www.toyota120.com/forum/showthread.php?t=9873

J
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Unread 04-03-2013, 11:07 AM   #18
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My VSC lights have been occasionally lingering after engine start-up then they'd go off. Now its happening with frequency. Today I plugged in my Techstream and see P0504. Is this an O2 sensor issue, or a brake switch issue? I'm seeing both reported in this thread and other places in the interweb. Any help would be greatly appreciated.
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Unread 04-03-2013, 11:16 AM   #19
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Quote:
Originally Posted by Dealmaker View Post
My VSC lights have been occasionally lingering after engine start-up then they'd go off. Now its happening with frequency. Today I plugged in my Techstream and see P0504. Is this an O2 sensor issue, or a brake switch issue? I'm seeing both reported in this thread and other places in the interweb. Any help would be greatly appreciated.
Do the brake lights work?


J
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Unread 04-03-2013, 12:05 PM   #20
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Yeah, as far as I could tell (having to back up to a wall and look thru the side-view mirrors as I was solo). I have noticed that the shifter had been sticking occasionally when going from P to D.
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