Bosch Oxygen Sensor P/N:16809
Bosch 13926 oxygen sensor for the 1986-1991 Mercedes-Benz 420SEL V8 4.2L and other vehicles measures the air-fuel ratio in the exhaust and reports it to the ECU. That feedback helps the ECU keep combustion stable and emissions down.
A failing oxygen sensor can show up as a check engine light, poor fuel economy or a rough idle. A misfire, an exhaust leak or a fuel delivery problem can be behind those signs too, so find the cause before you buy a sensor.
This upstream oxygen sensor also fits the 1986-1991 Mercedes-Benz 560SEC V8 5.6L and the 1986-1991 Mercedes-Benz 560SEL V8 5.6L.
Fit and size
Build and materials
One oxygen sensor with its wiring harness. This listing is one sensor, and the vehicles it fits take one. A mounting bracket is not included.
Is the Bosch 13926 a Mercedes 420SEL oxygen sensor for 1986-1991 cars with the V8 4.2L?
Yes. Bosch 13926 fits the 1986-1991 Mercedes-Benz 420SEL V8 4.2L, and it fits other cars as well. Look up your own year and engine in the "Vehicles it fits" section.
Does this Bosch premium oxygen sensor come with its wiring harness?
Yes. This Bosch 13926 listing is one upstream oxygen sensor with its wiring harness. A mounting bracket is not included.
What thread size does the Bosch 13926 use?
The thread size is M18 - 1.5. The sensor measures 37.8 in from the sealing surface to the end of the connector.
How can I tell if an upstream switching-type oxygen sensor is wearing out?
A check engine light, worse fuel economy or a rough idle can be signs of a worn sensor. A shop can read the codes and test the sensor.
Is this Bosch O2 sensor heated, and how fast does it warm up?
Yes. It is a narrow-band heated sensor with an integrated heater element, and it reaches operating temperature in under 10 seconds.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.