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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix. is the premier BMW Forum on the internet. Registered Users do not see the above ads.
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Old 12-03-2008, 05:11 AM   #1 (permalink)
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Code 1264 !

My '90 E30 convertible started running rough - stalling a bit - about six months ago. She has been garaged most of the time since.

Yesterday, I reset the OBD codes and ran the car. Idle had surged when the problem occured six months ago, but is now smooth. After warm up I took the car out on the road and stomped the gas pretty hard. The engine stalled, then caught itself, and operation seemed normal from then on out. I drove around for an hour yesterday, reset the code again and drove some more. The check engine light comes on as soon as you start to press down on the gas pedal.

The code I get is 1264 - O2 sensor heating element. Does this mean the sensor is bad, or could it be the wiring that connected to the sensor. That looks pretty bad to me. There is also a relay over on the RH side of the engine compartment near the radiator fill container, that relay tested fine for resistance.

I'd really like to get this problem solved!! I assume that the car will likely suffer in terms of gas mileage, and that I might foul up the plugs running without the O2 working properly.
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Old 12-03-2008, 07:10 AM   #2 (permalink)
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The O2 sensor is critical to fuel economy, during cruising driving. I'm guessing the light comes on when you tap the gas while moving or cruising. The O2 sensor is there to keep the Air/ Fuel ratio perfect to prevent loss in fuel during cruising. When you accelerate especially at Full throttle the computer takes it's info for fuel mixture from you MAF sensor MAP sensor and TP sensor. I've never seen a car almost fall on it's face from a faulty 02 sensor, I would look to the intake side of the engine for your "almost stalling" under full throttle problem!
I'm guessing that your 19 year old O2 sensor has read it's last 02 Molecule... You could just replace the sensor, not that hard to do and I'm guessing not too expensive either. Generally when you replace an old O2 sensor you'll see an increase in mileage, I've replaced 3 on 3 different cars and had seen an improvement in all! What do you got to lose?
Hope that helps... Good Luck!
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Old 12-03-2008, 07:39 AM   #3 (permalink)
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Jedz -

Good info. I should have noted that the O2 sensor was replaced in 2005. The car has been driven maybe 8K since.

I agree that the O2 sensor should not cause the engine to stall.

My fuel economy seems o.k. I drove 130 miles yesterday - mostly highway - averaging 55 mph. The computer was showing 24.5. I seem to get 20-21 around town; maybe more - the car has not been driven much lately.

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