Hi All,
I've bought my LS460 at 98k miles and it has been solid for the last two years I've owned it, now it's at 142k miles, the VSC Light came on with check engine. The code I pulled the first time was P0171 and I reset it (hoping for the best) and now the code is P2A00. The codes appear to target my oxygen sensor, Bank 1 Sensor 1. Where is that exactly? I'm usually pretty handy to DIY but the bank locations and sensor numbers confuse me. In addition, I'm not sure if it's "downstream or upstream" when looking up parts. Any diagram, explanations, or even part numbers would be appreciated please, thank you in advanced.

 

 

 

My thread on same issue:

https://www.clublexus.com/forums/ls-...e-control.html

My car kicked on the vsc, cel and I lost crusie for some reason. According to other members I should not have lost the cruise.

I just bought an 07 161k miles with P0032 on bank 1 sensor 1 o2 heater circuit fail. I also have been catching the car up on mntc items to meet or exceed the factory spec.

We are finishing replacement of the sensor this week. Bank1 is driver side. sensor 1 is the upstream unit which is ahead of the catalytic converter. The sensor is just above the engine cradle on driver side. The connector is a BEAR. The connector is mounted to ~ middle of the driver cylinder head at the back near the firewall. We found the connector end loose from its bracket which complicated things by not having a solid location.
If I did this again I would cut off the wire set and solder the new sensor in place. It takes several hours to remove everything to get to the sensor connectors; maybe if you have small hands and arms it would be easier.

Quotes range from $1000+ for replacement by dealer. I believe the time frame is 5-6 hours for the sensor. I paid ~140 for a Denso upstream sensor. Dealer cost was 250+ and labor is 130/hr or so.

The bolts slip right out with no issues or galling. My heat shield bolts were seized however which led to delays. After a few days of soaking them with PB blaster I decided to go from the top. My experience with removing seized bolts is a hit or miss track record. I had concerns over pulling the manifold and breaking an exhaust stud or damaging the head.

I gently pulled on the O2 sensor wire and used a small blade screwdriver to slip under the keeper for the connector. The connector slid apart nicely.

I had a leaking valve cover so I removed the cover which gave me just enough room to attach the sensor without pulling the steering shaft, manifold, ac compressor or heat shield. Upon inspection I found both high pressure fuel pump gasket and adapter gasket were soaking the valve covers in oil.

I also loosened the cradle bolts on the driver side to drop the engine down ~1". One member went the oppossite way by pulling the motor mount bottom bolt and raising the engine from the exposed stud.

My son who has mildly smaller hands than me could plug the connector but couldn't push it together to make it lock. I could get my fingers on the connector but couldn't make them push together. I used the same screwdriver at the back of the connector between the wires to push enough to make the lock.

There's a 1000 ways to skin this cat.

I have not found torque specs for the car very handy even asking other members to help. I think I'm in a class of car which only few are willing or able to own and work on such a vehicle.

There's a site called shop manuals which does have alot of this information but you have to go through page by page.

Good luck bud.

Rich

Good luck.

 

Wow, thank you kindly for this, that information is perfect! The car has been incredibly reliable and from what I've read, 142k miles isn't much on it, I plan to keep it a great while longer. See if I throw in the towel on the DIY, but I still have hope. Now I see the exact location and term (upstream) for the affected unit. That is great, I appreciate it.

 

Shop Manuals eh, after re-reading your comments I probably shouldn't be stubborn and just let someone else do it. I haven't gone to Fresno Lexus for a quote yet, I've been using my other cars at the moment. The LS still drives fine and gets good gas mileage, the code is being pulled from an OBD II reader but at least the Check Engine light and VSC remain off. I'm hoping I don't come across the valve cover issue either, it's like reading a horror story as to what else could be lurking in there. Positive thoughts I suppose, thanks again.

 

 

 

Hey man, just wanted to touch base. I have the same P0174 code and have tried the replacing the battery, fuel cap and cleaning the MAF sensors. What ended up working for you? I have an appt on Monday at 9AM to dig into it at a Goodyear auto shop. Thanks for any help capt.

 

Hello! Just curious if the leaky fuel pump gaskets caused this issue for you. There is a recall that I am curious if it could cause this fault? See below. Thanks for any help. My OBDII says Bank 2 air/ fuel leak

 

I replaced the charcoal canister assembly. I was unable to diagnose the code myself. I contacted a local mechanic who verified the charcoal canister assembly was bad. I ordered one off ebay for $50. So far the system has been happy and so am I.

Rich.

 

I'm ashamed to say, I'm not sure what it was after all. I had purchased the Denso 234-9052 O2 sensor and I took it to a local shop which also sold cars, I ended up trading in the LS460 for an extended length Lincoln Navigator SUV and giving them the O2 sensor. Do tell what it is once you get it taken care of, I'm curious.

 

Just picked up my LS from the Goodyear. They found a dirty MAF sensor and a misplaced air filter which allowed debris to pass through. I hope that is the fix and she holds up another 10 years or more

 

Thanks for the response. I have not heard of this as a problem. Good to know for future reference!

 

[Passenger side just before your catalytic converter. I inadvertently pulled the clip off the car side of that sensor wire. Bought a new clup, but now I'm left puzzling out the color positioning of the wires on the car/compuer side of the connection..

QUOTE=capt;10460092]Hi All,
I've bought my LS460 at 98k miles and it has been solid for the last two years I've owned it, now it's at 142k miles, the VSC Light came on with check engine. The code I pulled the first time was P0171 and I reset it (hoping for the best) and now the code is P2A00. The codes appear to target my oxygen sensor, Bank 1 Sensor 1. Where is that exactly? I'm usually pretty handy to DIY but the bank locations and sensor numbers confuse me. In addition, I'm not sure if it's "downstream or upstream" when looking up parts. Any diagram, explanations, or even part numbers would be appreciated please, thank you in advanced.[/QUOTE]