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| 06-15-2015, 08:57 AM | #1 |
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Second Lieutenant
 
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O2 Sensor - code PO132 - which one?
Just picked up a lightly used 2008 E90 M3 and there is an error code for one of the O2 sensors: P0132 (and also P0132 P).
I looked it up and it appears to be "Bank 1, Sensor 1". My understanding is that this means I need to replace the pre-cat O2 sensor? Also, I've read that some people recommend replacing both sensors (I guess there are two pre-cat sensors for each cylinder)? Looking at the ECS Tuning website, I'm not quite sure which O2 sensor this equates to as they are refer to them as "Front Position" and "Rear Position": http://www.ecstuning.com/BMW-E90-M3-...Oxygen_Sensor/ Can anyone confirm?
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BMW M3 (G80)
Gone: 911 GTS, BMW 1M, E46 M3, X7 M50i, Porsche Cayenne GTS, X5M, M2CS, Cayman GT4 (981), Alfa Giulia QV, Carrera T, F80 M3 CS, Focus RS, M2 (OG), 14 E63S AMG wagon, M3 & M4 (F8X), X5 (F15 & E70), 335IS, VW Golf R (MK7), Audi SQ5, Cayman (987), M3 (E90), M5 MT (F10), A4 Avant (B8), S4 (B8), RS4 (B7), VW GTIs (MK2 to MK6) |
| 06-15-2015, 09:19 AM | #2 |
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First Lieutenant
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Hi MarkFT,
Bank 1 Sensor 1 would be "Front Position" - closest to the engine (before the cat). Sensor 2 would be "Rear Position" - furthest away (after cat). Your car has two banks, 2 sensors each (4 sensors in total). |
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| 06-15-2015, 09:22 AM | #3 |
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Second Lieutenant
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Great, thanks! Since I'm under there, I'm assuming it is a good idea to replace both the pre- and post-cat sensors in that pair?
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BMW M3 (G80)
Gone: 911 GTS, BMW 1M, E46 M3, X7 M50i, Porsche Cayenne GTS, X5M, M2CS, Cayman GT4 (981), Alfa Giulia QV, Carrera T, F80 M3 CS, Focus RS, M2 (OG), 14 E63S AMG wagon, M3 & M4 (F8X), X5 (F15 & E70), 335IS, VW Golf R (MK7), Audi SQ5, Cayman (987), M3 (E90), M5 MT (F10), A4 Avant (B8), S4 (B8), RS4 (B7), VW GTIs (MK2 to MK6) |
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| 06-17-2015, 04:27 AM | #4 |
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I would replace both pre-cats. They are the ones that give the a/f ratio. No need for the post cats until they throw a code. The post cats usually go on when your cat goes bad...
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| 08-31-2015, 09:34 AM | #5 |
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///M
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I just got out of the dealership and both my Pre-Cat sensors are gone. I was informed that BMW replaced the PRE cat sensors with new part numbers recently. Also there was a software update for the ECU that handles the sensors in the exhaust system to go along with the new parts.
Anyone know any one else heard something similar? |
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| 08-31-2015, 11:15 AM | #6 |
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Mr. Nice Says Hello
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Interesting. I just replaced all my 02s and was not aware of that.
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| 08-31-2015, 04:07 PM | #7 |
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First Lieutenant
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The part is made by Bosch, and is available from Amazon for much less if you by the Bosch Motorsports item instead of relabled BMW one. You only have to replace the faulty one, they don't burn out in pairs.
edit: pre-cat is: Bosch 17039 Oxygen Sensor, OE Type Fitment currently out of stock but amazon sells for $104. |
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