'00 LS400 OEM Engine harness availibility?

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alha

New Member
I'm in one of those situations you can't believe happened to you... I went on vacation a few weeks ago, left the car in the driveway (like it has been daily for the last 8-9 years). Came home a week later, and noticed the throttle didn't 'pop' like it usually does, it was fairly sluggish off the line. Then saw that the CEL was on, so took it to the dealer, and the code read knock sensor error. They inspected it and saw that a mouse had decided the space under the intake looked like a good place to set up home. And there was free lunch there too! My wiring and vacuum hoses that is.

I was in a pinch, so I ok'ed the repair. They suggested that since the car has 170,000 miles on it, it'd be a good idea since the intake was already off, to replace the knock sensors. After swallowing hard, I said to just do it. $1250 later I get my car back, running like it did before I went on my (now much more expensive) vacation.

I had it back home for 3 days, and noticed that the check engine light was back on again, so I assumed that they had knocked something loose while they were doing the repair, or maybe hadn't reconnected a sensor properly. I dropped it back off, and got a call the next morning, saying you aren't going to believe this, but it looks like that mouse had came back! They hadn't pulled the intake, but looked around under there with a flashlight and mirror, and it appears that it happened again. This time it would _only_ cost about $850. Only. On top of the $1200 I've already spent. At that point, I decided that, as they had already done the hard work for me (pulling it apart the first time, and breaking whatever was going to break during the removal), I was going to fix it myself.

They had said that the 1st repair had replaced some vacuum hoses, and repaired some wires. I called the parts dept, because I am not a fan of splicing and shrink tubing wires, I'd rather have new in there, if available and reasonably priced. Talking to the parts guy, he said that I would need housings and terminals, and make up new wires. I asked him about just replacing the top of engine harness, because I don't want to possibly miss a small nick that the rodent had made on one of the numerous wires under there, and a few years down the road have another CEL come on or wire corrode and break. He said that he would have to do some digging, but he didn't believe that they were available. I have yet to hear back from them, but does anyone here know if they are, as that would be ideal for me. Relatively quick and painless, except for my wallet of course.

I had just put about $3k into it about 7-9 months ago, including aftermarket cats, because my wife loves the car, and we're pretty much keeping it till the wheels fall off, or so I am told. So I'm pretty much married to it at this point. If anyone could pass along any info on it, or what they have done in a similiar situation with their LS400, I'd appreciate it. Also, comments/suggestions regarding any gotchas or things to look out for when pulling the intake, or doing the harness would also be greatly appreciated.

On a side note, I've gone full Caddyshack on this rodent. Well, almost. Sadly no explosives, but I did hit the store and have bought about 15-20 enclosed poison traps, and have placed them strategically around the cars and front of the house, as well as near some trees next to the driveway. That rodent will rue the day he ever messed with me, and cost me about $1500 and a weekend of my time...
 
Make that bastard die painfully, bury it alive or something

Knock sensor loom is a separate bit of engine loom (it has its own connector located on the back of the engine), and it can be repaired by moderately skilled radio amateur, which is going to be more reasonably priced. Especially keeping in mind that by now you have a spare destroyed piece.
 
lol If I can lay my hands upon it, you can be certain it will be an unpleasant ending... This has been an adventure in wiring harnesses, I've spoken to my dealer, and one from out of state that offers decent discounts on parts, which mine doesn't, and have had a hard time coming up with a harness part number for that specific one. The part # we did come up with which corresponded to my VIN is 82121-50410.

Seeing as I have yet to pull the intake, I haven't been able to verify if this is the part you are mentioning, but from the sounds of it it isn't, because even with a discount, that harness is about $1000, and looks to go thru the firewall with three connectors in the cabin. The one I was hoping that they designed was like you described, a short harness which connects to the main one, still inside the engine compartment, and much less expensive. If you might have an example of the part that you are describing, just so I can give it to them so they can see what I am really looking for, and then find the correct P/N for my car, I would really appreciate it. I'd hate to order the big one, tear it apart, and find that the portion of the harness isn't even a part of it, and have to be without a car for days waiting on the part to come in, if it's even still available.

Thanks for any light you can shine on this mess!
 
Well, turns out that I am running into a time crunch with my backyard construction project, so I decided to contact a local shop that works on Lexus but whose rates are substantially cheaper. I ended up finding the correct harness, the one I listed above, and brought it in with the other stuff needed to complete the job. They pulled it apart yesterday, and found a lovely, cooked family of mice under there, I had a big grin on my face when I heard that. On the downside, the little shatz had eaten back the plastic connector on one of the 2 brand new knock sensors, so there went another $150... At least they were able to repair it again, and I sent back the harness to the out of state dealer for a full credit.

It should be done today, and since I now have the new LS400, I am putting this one up on the block. It hit craigslist yesterday, and have already had one, albeit a bit low, offer. I have the full service records from Lexus, and it's funny (sad funny) how you forget how much you have done over the years. I'm going to be pretty firm on the price, she's in great shape for her age and has had many of the more expensive parts replaced already.

Thanks everyone for your suggestions, I appreciated them.
 
Congratulations
I couldn't find that piece of loom in my catalog, however I recently replaced ACIS valve (it usually fails on aged engines, and ECM doesn't throw any DTC). So I had to undo the intake, replaced the knock sensors (just incase), and I'm pretty sure that the knock sensors and starter loom is detachable from main engine harness (one that goes through firewall)
 


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