Source for Ignition Coils
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You can get all 8 DENSO from rockauto for around $430. This is the same coil you're going to get from the dealer for less than half the price. I honestly wouldn't replace all 8 at a time though. If one fails I would replace it. Pull them out and check them. If there are any that are cracked, replace them. Keep a spare in case one craps out on the road and call it a day. These aren't bmw's where they need to be replaced in sets.
There are some on here that will swear up and down that DENSO parts contracted by Toyota to be used as OEM are built to a higher standard than DENSO would otherwise offer on the open market. I'm not sure I believe the truth of that to the extent that it's claimed. I would need some demonstrable evidence of that. Especially when dealing with specifically DENSO. I personally would trust RockAuto DENSO coils to serve my Toyota effectively for a LONG time. Having said that though, I'm a little bit of a hypocrite on that front in that I bought lightly used OEM coils here on Mud for use when I did a spark plug change (with DENSO Iridium TT plugs, not Toyota dealer sourced)
"You can get all 8 DENSO from rockauto for around $430. This is the same coil you're going to get from the dealer for less than half the price"
Respectfully.....This is not true.
2012 Pilot with a Denso alternator died at 100K miles. A toyota denso alternator can go 200K + miles and just need a brush kit.
A koyo bearing in a Koyo box is not as good (spec'd) as a Koyo bearing in a toyota box.
Aisin water pump in an Aisin box is not as good as aisin water pump in a toyota box..
Mitsuboshi T-belt is not as good as a Mitsuboshi toyota Belt. (toyota belts can be driven 175K miles but not a mitsuboshi)
A Koito bulb in a Koito box is not as good as a koito bulb in a toyota box
NOK oil seal is not as good as a NOK oil seal in a Toyota box.
In this forum we have noticed denso radiators having leaking issues while no toyota/denso radiator had any issues out of the box.
I have experienced all these.
Respectfully.....This is not true.
2012 Pilot with a Denso alternator died at 100K miles. A toyota denso alternator can go 200K + miles and just need a brush kit.
A koyo bearing in a Koyo box is not as good (spec'd) as a Koyo bearing in a toyota box.
Aisin water pump in an Aisin box is not as good as aisin water pump in a toyota box..
Mitsuboshi T-belt is not as good as a Mitsuboshi toyota Belt. (toyota belts can be driven 175K miles but not a mitsuboshi)
A Koito bulb in a Koito box is not as good as a koito bulb in a toyota box
NOK oil seal is not as good as a NOK oil seal in a Toyota box.
In this forum we have noticed denso radiators having leaking issues while no toyota/denso radiator had any issues out of the box.
I have experienced all these.
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Then why is the Toyota part number removed if they're not the same? All of those OE parts are just as good as OEM, same manufacturer, same lines, it would be a stupid process for them to run two complete lines for the same part knowing one is supposedly lesser quality. It comes in a Toyota box so that the Toyota service department can say/show we installed a Toyota part.
Yes, Aisin parts are generally as good as Toyota parts because Aisin is a major OEM supplier that is part of the Toyota Group and supplies many original parts directly to Toyota. The main difference is that a Toyota-branded part includes the Toyota logo, while an Aisin-branded part from the aftermarket is essentially the same component without the logo.
Yes, Aisin parts are generally as good as Toyota parts because Aisin is a major OEM supplier that is part of the Toyota Group and supplies many original parts directly to Toyota. The main difference is that a Toyota-branded part includes the Toyota logo, while an Aisin-branded part from the aftermarket is essentially the same component without the logo.
- Part of the same group:
Aisin is a member of the Toyota Group, and the two companies have a long-standing relationship. - OEM supplier:
Aisin is a primary original equipment manufacturer (OEM) supplier for Toyota, meaning it makes many of the parts that go into new Toyota vehicles.
Equivalent quality:
Because Aisin supplies the parts for Toyota, its aftermarket parts are typically made to meet or exceed the original equipment specifications, making them of equal or better quality than other aftermarket brands.
Cost savings:
You can often save money by buying Aisin-branded parts instead of Toyota-branded parts, as you are paying for the part itself rather than the Toyota logo
^ ^ ^ that was my thought process as well...it would cost more to change the part, buy different raw materials, adjust the production methods...then to simply follow the same practices for their own inventories. Plus...
You can clearly see where the Toyota-specific information was milled off the part.
The only plausible argument one could make is that they were selling "seconds" or parts that didn't test up to OEM standards. But that's not what's being claimed.
You can clearly see where the Toyota-specific information was milled off the part.
The only plausible argument one could make is that they were selling "seconds" or parts that didn't test up to OEM standards. But that's not what's being claimed.
I respect all your views
What puzzles me is they spend extra $$ to mill off the oem part number "toyota" logo, put a new sticker and still selling 1/3 the price is not a major business will do.
I'll share one example about the Koyo bearing in koyo box and in a toyota box
I installed a toyota boxed koyo bearing into our Hilux rear axle. Another person brought a koyo bearing at the same time and installed into a Hiace axle. At the beginning the toyota boxed Koyo had a play out of the box! and koyo bearing in the koyo box got no play!!! I though why????
The machine shop guy asked me to wait until he drive the bearing into the axle shaft! Once driven into the axles, i noticed Toyota boxed koyo bearing had no play and the backing plate spun freely.. while koyo bearing that was in the koyo box was quite tight to spin.
Both were Koyo bearings... but Toyota kept about 0.00001 m or so space to expand!
Koyo or any OEM supplier must follow Toyota specs to make the part 100% to meet toyota standards.
I am just trying to inform people who have money to get the OEM to get the OEM as it will last 2 to 3 times or more of the same part made by the OE supplier.
Lastly there is no manufacturer that make a part to meet or exceed the quality of a Toyota boxed part.
Thanks!
That would be my guess..... but the Denso 2nds are really good... just not up to the spec Toyota wanted but still worlds better than other aftermarket competitors. Personally, I do believe the Toyota branded ones will be of higher quality. But on a 25 year old vehicle, paying 20-50% more for a part that is 5-10% better or with a slightly lower failure rate isn't worth it. For electronic parts, these are worlds better than those "life-time warranty" parts you see advertised at the local auto parts store.
If I was restoring or retaining a classic vehicle, OE all the way no matter what.
Only proof there is that some parts have Toyota logos on them from the OE supplier that are removed and sold under that supplier's name. As to why, it's all speculation and shouldn't be perpetuated as fact.
nissanh
I really appreciate your feedback and being so respectful with it. It’s nice to post something and not get ripped for your thoughts and opinions. I’ve really liked coming here for information on my LC and love all the different views and opinions to help form mine.
Keep it up!
Plenty of variables in this single account. Hilux and Hiace? A machine shop guy letting you watch him work. Sounds like we may be in a, shall we say, "lesser developed" country? More potential for a shaky parts supply chain, more counterfeit potential. Non-enthusiasts who supply their own parts usually shop around for the cheapest crap. I've seen plenty of counterfeit parts under name brand boxes like Koyo, Denso, or Aisin. Pretty sure Koyo bearings are branded as JTEKT now as well. We should compare how a Koyo boxed Koyo bearing installed into a Hilux axle shaft as well.
My brother used to be a service writer at a dealership. Trust me, it's the same parts. Just because you got a Koyo bearing that didn't last doesn't really mean much. Maybe you just got a bad one. I once purchased a denso AC compressor for my wife's Mercedes from rockauto. It was Identical in every way to the one that came off the car. Unfortunately, it only lasted six months. I sent it back to rockauto and got another one. That one's been going strong for ten years now. Sometimes you just get a bad part. This can happen from the dealership as well. I also have an aisin water pump setting in my garage waiting to go on a vehicle as we speak. You can literally see where the toyota logo has been ground off of it. I will say though, I would never purchase parts that I relied on from amazon. There's just too many fakes out there. Rockauto is a trusted source.
@jsloden I believe many OEM parts are exactly the same but some are not. You would usually need to be at the manufacturing level to be able to identify the differences. It's easy to imagine a vehicle manufacturer would get the pick of the litter for parts such as a car battery, where a defective battery could have a huge impact on a manufacturers reliability rating. But the consumer sees the same product, if judging by appearance alone.
www.repairerdrivennews.com
Denso: OEM, aftermarket parts from same manufacturer not necessarily identical
It’s sometimes asserted that OEM and aftermarket parts made by the same manufactuer are identical. But a leading Tier 1 supplier producing both confirmed last month differences might exist. D…
I'm following this thread closely, it's a great discussion and I appreciate the information brought to the table. Thanks everyone. 
Thanks for the article. Very informative. I will say, I'm not against buying parts from the dealership completely. I have had to buy several parts from them in the past. This is mainly due to not being able to figure out who made the part to begin with. There are also updates to certain products over time as well that if you purchase from the dealership you may get the outdated one. I was looking at an idler pulley for my 96 bronco. I went on rockauto and it showed the original plastic pulley had been updated with a metal part. The was the motorcraft part with the FOMOCO logo on it. I went to the dealer and they typed in the part number and it still pulled up the plastic pulley. This is also the part they had in stock. I will say though I wouldn't hesitate at all to buy the denso coils from rockauto at half the price. Just don't get them from amazon unless it's a trusted source.@jsloden I believe many OEM parts are exactly the same but some are not. You would usually need to be at the manufacturing level to be able to identify the differences. It's easy to imagine a vehicle manufacturer would get the pick of the litter for parts such as a car battery, where a defective battery could have a huge impact on a manufacturers reliability rating. But the consumer sees the same product, if judging by appearance alone.
Denso: OEM, aftermarket parts from same manufacturer not necessarily identical
It’s sometimes asserted that OEM and aftermarket parts made by the same manufactuer are identical. But a leading Tier 1 supplier producing both confirmed last month differences might exist. D…
Also, In the article, it says:
"Williams gave the hypothetical example of an OEM platform with a 41 mm condensor. Denso might decide to make a 40 mm aftermarket condensor able to fit vehicles with 39-42 mm condensors for a requirement like “’85 percent of OE cooling....Finally, no distributor wants a distinct aftermarket part for every car ever made — they want to stock an aftermarket part from the Tier 1 that’s able to fit multiple models, Williams said. “Nobody wants one radiator, one car,” he said. “They want one radiator, 50 cars.”
If you notice, Denso aftermarket sells one Ignition Coil 673-1303 for all years, 98-07. But if buying from Toyota, there are two part numbers.... 98-03 and 04-07. As far as I can tell, the 98-03 coil isn't superseded to the later part number. Difference? I dunno but not different enough for Denso to offer both.
Same with the radiators.... (I realize Denso is not the OE supplier) but for Genuine Toyota, there are 2+ radiators for 98-05. Denso offers just one radiator for 98-05.
"Williams gave the hypothetical example of an OEM platform with a 41 mm condensor. Denso might decide to make a 40 mm aftermarket condensor able to fit vehicles with 39-42 mm condensors for a requirement like “’85 percent of OE cooling....Finally, no distributor wants a distinct aftermarket part for every car ever made — they want to stock an aftermarket part from the Tier 1 that’s able to fit multiple models, Williams said. “Nobody wants one radiator, one car,” he said. “They want one radiator, 50 cars.”
If you notice, Denso aftermarket sells one Ignition Coil 673-1303 for all years, 98-07. But if buying from Toyota, there are two part numbers.... 98-03 and 04-07. As far as I can tell, the 98-03 coil isn't superseded to the later part number. Difference? I dunno but not different enough for Denso to offer both.
Same with the radiators.... (I realize Denso is not the OE supplier) but for Genuine Toyota, there are 2+ radiators for 98-05. Denso offers just one radiator for 98-05.
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The article also says this. Strategic in this case equals cost savings.
"Correction: An earlier version of this article implied DENSO had called OEM and aftermarket parts from the same manufacturer different in all circumstances. DENSO didn’t express things in such an absolute fashion; merely that strategic and contractual reasons existed why such differences would occur. The article has since been corrected to reflect this."
"Correction: An earlier version of this article implied DENSO had called OEM and aftermarket parts from the same manufacturer different in all circumstances. DENSO didn’t express things in such an absolute fashion; merely that strategic and contractual reasons existed why such differences would occur. The article has since been corrected to reflect this."