The Random E46/ZHP Question Thread

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Originally Posted by ComradeNick

Aw man I’m paying close 4 bucks a gallon for 91 octane. And that’s CA 91 which is diluted with ethanol -_-.


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$4.01 in NorCal

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Originally Posted by Sockethead

Pre-cat. Yep it’s easy. They are right on top of the manifold

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Just watched a 50skid video. Looks easy. What is the part number? On FCP euro I am seeing 3 different kinds of o2 sensor. I am guessing it's the one labeled "upstream"... damn these things are expensive!
Also, while on the topic, how often should post-cat sensors be replaced?

UPDATE: found which o2 sensors I need. They are way more expensive for newer e46s. Over $250 for a pair :facepalm

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Originally Posted by stephenkirsh

$4.01 in NorCal

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Where are you? I just filled up in NorCal and drove down to SoCal for uni. I paid 3.65 for 91 a few mins north of SF.

Was really shocked to see I could really only get 24mpg on my journey. It was cold, it was raining hard, and I had 300lbs of stuff in the car, but I don’t feel that’s a good reason to lose 4-5MPG. Definitely will ponder on the pre car sensors

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Originally Posted by papa_g

Just watched a 50skid video. Looks easy. What is the part number? On FCP euro I am seeing 3 different kinds of o2 sensor. I am guessing it's the one labeled "upstream"... damn these things are expensive!
Also, while on the topic, how often should post-cat sensors be replaced?

UPDATE: found which o2 sensors I need. They are way more expensive for newer e46s. Over $250 for a pair :facepalm

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Don't buy the OE ones; they're a total waste of money. Get the Bosch ones, PN 17215, Qty 2. Same part number for both banks. Way cheaper, same part.

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Originally Posted by az3579

Don't buy the OE ones; they're a total waste of money. Get the Bosch ones, PN 17215, Qty 2. Same part number for both banks. Way cheaper, same part.

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This right here is the ticket. And O2 sensors are definitely something that you don't want to go off-brand on. You'll see plenty of Chinese options in the $50 range when you search for the Bosch part number, but you'll just end up with the same problems from a slow reacting sensor.

Bosch 17215 Oxygen Sensor, Original Equipment (BMW) https://www.amazon.com/dp/B000CF3WOY..._AHHmCb2NKM680

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Originally Posted by YoitsTmac

Where are you? I just filled up in NorCal and drove down to SoCal for uni. I paid 3.65 for 91 a few mins north of SF.

Was really shocked to see I could really only get 24mpg on my journey. It was cold, it was raining hard, and I had 300lbs of stuff in the car, but I don’t feel that’s a good reason to lose 4-5MPG. Definitely will ponder on the pre car sensors

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Petaluma. It’s always slightly more expensive than SF for some reason.

Would bad O2 sensors throw a code?

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Originally Posted by johnrando

Would bad O2 sensors throw a code?

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Yes. Not a specific one, though.

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Originally Posted by johnrando

Would bad O2 sensors throw a code?

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If they are reading out of spec, then yes. Sometimes they can just be really worn but not bad enough to throw a code. In these instances you'll lose out on fuel economy, but the readings would still be within spec to not trigger a code.

My cat(s) are definitely bad. I wouldn't say clogged, but this shouldn't be happening. The Bank 1, Sensor 2 voltage should be relatively stable like the Bank 2 Sensor 2 voltage. I have headers coming soon :)

https://farm5.staticflickr.com/4914/...24848b62_z.jpg