OEM Denso vs Denso aftermarket, insight straight from Denso

[PandaBear]

They are arguably consumables - handful of OEMs did recommend replacing them at prescribed intervals.

Do you keep your old spark plugs, drive belts and air filters too?

Sometimes. I keep at least 1 set of old plugs just in case. One time I had to go back to the old set of wires because something is wrong with the new ones.

 

[Hohn]

IMHO, buying parts .... is a gamble.

FIFY.

 

[Hohn]

So is Toyota the "OEM" or is Denso the "OEM"?

There are two different definitions for Original Equipment Manufacturer and both are about equally popular. Calling Denso the OEM seems more logical to me, but then what is Toyota? The Final Assembler?

Toyota is the OEM. Denso is a supplier.

We build engines as an engine OEM. We have suppliers who make engine parts. But to Komatsu, we are an engine supplier. They are the equipment OEM to whom we are just a supplier.

In other words, who the OEM is depends on the level of assembly the part is going into. If a cummins-powered Komatsu customer orders "Genuine OEM parts", they can get them from Komatsu (as the truck OEM) or from Cummins (as the supplier of those parts). Cummins offers "Aftermarket" parts that are not Komatsu OEM-- Reconditioned injectors, for example. They are not Komatsu OEM parts because Komatsu trucks do not roll off the line with reconditioned injectors.

Since Toyota builds its own engines for its own equipment, they are the OEM for engine parts.

When we say "OEM" parts, we mean the exact same parts used by the "original equipment maker" to make the thing that the part is part of.

 

[iCurious]

Denso Downstream O2 sensor just failed on my wife’s Accord after 9 months and 5K?

Prior Denso lasted a couple years.

OE Denso lasted over 10 years and was originally replaced for giggles, oops.

Same goes with Bosch, NTK, and Denso. Aftermarket quality is no longer any good. It is cheaper upfront but more expensive in the long run. I just buy OE whenever possible.