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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > O2 sensor replacement number?



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      08-26-2019, 02:32 PM   #1
thormessiah
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O2 sensor replacement number?

Iím looking to replace my o2 sensors since Iím getting downpipes as a preventive maintenance. Which are the ones that tend to go bad , the pre cat ones?
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      08-27-2019, 04:59 AM   #2
Efthreeoh
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Why would you replace them when they are working correctly? Wait until one throws a code.
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission.
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      08-27-2019, 11:37 PM   #3
thormessiah
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Quote:
Originally Posted by Efthreeoh View Post
Why would you replace them when they are working correctly? Wait until one throws a code.
Since Iím getting downpipes, Iíd save on labor by getting them replaced at the same time.
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