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The DENSO 234-4808 is a direct-fit oxygen sensor for several Audi, Volkswagen and Porsche models from the mid-2000s. It is built to OE specifications, with an aluminum oxide trap layer that shields the ceramic element from silicone and lead contamination. That protection is the main difference from generic sensors, which tend to foul sooner and can set codes again. It suits owners of the listed A4, A8, TT and related VW/Porsche applications who want a first-time fit rather than a splice-in universal sensor.
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Lowest price we've seen: $94.35 on Nov 12 at PartsHawk. Tracked across 13 stores since Nov 12.
Owners of the listed Audi and VW models generally report the sensor plugs in and clears oxygen-sensor codes, with fit matching the original part. Complaints center on price against universal sensors and on sensors that fail again when the engine has another fault.
This DENSO oxygen sensor (part number 234-4808) is made as an exact-fit replacement part. DENSO states it is manufactured and tested to OE standards, with each component precision built for a first-time fit.
The sensor has an aluminum oxide trap layer. This layer protects the ceramic element from silicone and lead poisoning. DENSO states that this supports engine performance, fuel efficiency and longevity.
It fits select Audi, Porsche and Volkswagen models, listed below.
