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General E46 Forum
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Old 10-09-2012, 12:45 PM   #1
a32axo
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Passed smog with codes! Yeah

So I had smog check done on my car yesterday, had codes P2240 and P2237, oxygen sensors. No CEL light but show up on OBDII.

Car passed!! Yes. My question is, so are my oxygen sensors fine? What is wrong with my car then? Have hesitation on freeway speeds. So im thinking the dme update is the problem.
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Old 10-09-2012, 01:23 PM   #2
MercForHire
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Stop right there criminal scum! You have violated the law!
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Old 10-09-2012, 01:31 PM   #3
jdstrickland
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I'm curious how you can have the codes you said and not have the CEL on.

P2237 BMW O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1
P2240 BMW O2 Sensor Positive Current Control Circuit/Open Bank 2 Sensor 1


The Control Current seems to be a vital part of the system. If there is no control current, then it seems that the signal that comes back to the computer would be missing or not working. A control signal goes out to the sensors, depending upon the contents of the exhaust stream there is a signal that is returned. For the sake of simplicity, I will assume that the control is 5v, if the contents of the exhaust are right then the return is 5v also, and if the contents are wrong then the return is 1v. (I don't know what the real numbers are, but my point is that if there is no control then there is nothing returned, and the car should not be able to pass smog in this condition.)

So, I wonder what is really going on.
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Old 10-09-2012, 01:33 PM   #4
jdstrickland
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The codes do not say the sensors are bad, they say that the voltage generated by the computer that is compared to the voltages returned by the sensor is missing.
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Old 10-09-2012, 01:34 PM   #5
SeanC
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Quote:
Originally Posted by jdstrickland View Post
I'm curious how you can have the codes you said and not have the CEL on.
SES comes on only after a certain number of faults is stored in the memory.
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Old 10-09-2012, 01:46 PM   #6
a32axo
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Simple, the codes come and go, car runs good except for slight stutter highway speeds. Gas mpg is at 20 mpg, really no highway driving and alot of short trips.

Took to smog place and guy said it passed. $50 don't get u an illegal smog!
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Old 10-09-2012, 01:58 PM   #7
325CiMaN
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The ses light or check engine light comes on when computer calculates that the vehicle emissions level exceeds 1.5x the normal operating amount. The amount was set by the feds. That came right out of our book from school.

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Old 10-09-2012, 02:02 PM   #8
a32axo
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Originally Posted by jdstrickland View Post
The codes do not say the sensors are bad, they say that the voltage generated by the computer that is compared to the voltages returned by the sensor is missing.
So how do I fix this problem if sensors are good?
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Old 10-09-2012, 02:12 PM   #9
325CiMaN
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So how do I fix this problem if sensors are good?
You can try pulling them off and cleaning them, with a defouler, or brake clean and a tooth brush.

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Old 10-09-2012, 02:25 PM   #10
a32axo
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Which ones are they? The ones that sit on top, that I can see from passenger side of engine?
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Old 10-09-2012, 02:25 PM   #11
joegr
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Originally Posted by 325CiMaN View Post
The ses light or check engine light comes on when computer calculates that the vehicle emissions level exceeds 1.5x the normal operating amount. The amount was set by the feds. That came right out of our book from school.

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In the US at least, the check engine light can come on for other reasons as well. One example is automatic transmission faults.
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Old 10-09-2012, 03:41 PM   #12
325CiMaN
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Which ones are they? The ones that sit on top, that I can see from passenger side of engine?
Bank one sensor one and bank two sensor one, are the ones on top. Sensor two are the ones after cat

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