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Old 09-30-2014
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I am: Erin
Join Date: Sep 2014
Location: Chardon, Ohio
Vehicle: 2000 Ranger
Drive Type: 4x4
Engine: 4.0
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Bosch Oxygen Sensor???

I am needing to replace the oxygen sensors in my 2000 Ranger. I think I heard somewhere that you should not use the Bosch brand to replace. Does anyone have any experience with the Bosch oxygen sensors or if there is a better after market brand?

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Old 09-30-2014
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I am: Ron Dean
Join Date: Jan 2014
Location: Vancouver, BC
Vehicle: 1994 Ford Ranger
Drive Type: 4x4
Engine: 4.0
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Bosch or Denso are fine to use as replacement of OEM O2 sensors

Have used both without issue over the years.

Upstream O2 sensors(close to engine) are used by computer to determine if air/fuel mix is too lean or too rich
Downstream O2 sensor(s) are used to test if Cat converter is working, they don't effect performance

You only need to replace upstream sensors unless you have a specific DTC code(check engine light on) regarding downstream sensor, downstream sensor(s) last twice as long since they only see "cleaned" exhaust after the Cat

Last edited by RonD; 09-30-2014 at 10:34 AM.
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