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Old 03-11-2014, 08:27 AM   #1
MarkIRL
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Struggling to understand fault codes

Hi guys, recently purchased my 2002 330ci with 72,000 Miles

Noticed few days ago when driving (had about 25 miles range according to the dashboard) that my engine management light came on.

Purchased a diagnostics tool online to shed some light on what was wrong before I took it to a mechanic and it has thrown up these 3 codes:

P0313: Misfire detected low fuel level
P0171: System too lean (bank 1)
P0161: o2 Sensor heater malfunction (bank 2 sensor 2)

Could it be that each of these factors are connected or is that a stupid idea? Also if anyone has any idea about how much these are likely to cost to fix please let me know, I'm struggling finding answers online
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Old 03-11-2014, 08:33 AM   #2
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maybe i'm wrong but if your running way to lean then the engine could possibly misfire. there for making sense now the car running lean could be the 02 sensor but i'm pretty sure when 02 sensors stop working properly they run rich, i could be wrong but that's what i would say.
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Old 03-11-2014, 08:37 AM   #3
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Have you tried adding fuel?
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Old 03-11-2014, 08:38 AM   #4
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Quote:
Originally Posted by e34_spangler View Post
maybe i'm wrong but if your running way to lean then the engine could possibly misfire. there for making sense now the car running lean could be the 02 sensor but i'm pretty sure when 02 sensors stop working properly they run rich, i could be wrong but that's what i would say.
You are wrong. Op, I think your fuel pump is on its way out causing the engine to be starved of fuel. Easy diy but don't run your gas so low.
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Old 03-11-2014, 10:37 AM   #5
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The first two codes are connected. Does your scan tool show freeze frame?
If yes, post it.
The O2 sensor makes no difference, sensor 2 is only there to monitor the cat.
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"Would the codes indicate if it's the carburator?"
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Old 03-11-2014, 11:02 AM   #6
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Air leak...lower intake boot is a popular leak...but you should look for broken/cracked hoses--vac hoses, intake boots, ccv vent hose...and others. Smoke test it.

Could be fuel pump or filter as mentioned.

Probably not clogged injectors but Techron is always okay to add to the fuel tank.

Could be you are just low on fuel with a bad level sending unit.
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Old 03-11-2014, 11:09 AM   #7
MarkIRL
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Thanks very much for the input guys! Seems to be quite common!

Will I do any damage driving the car as normal until I get them checked?
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Old 03-11-2014, 11:53 AM   #8
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Update:

Had a better look around the intake boot, the upper part has quite a lot of electrical tape where it's attached to the (lower bit?) So I'm assuming the previous owner repaired it with electrical tape and the repair has now failed. Does that sound quite likely?
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Old 03-11-2014, 11:54 AM   #9
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No, but you should add gas first...and keep the tank above 1/4 full...

cross posted...yes, electrical tape isn't a good sign...and you should inspect the lower boot as it cracks at the elbow going to the icv all the time! $12 for new lower intake boot...you might as well just replace both...and while there might as well clean icv and tb just because. And read more threads after searching for your codes...especially 0171. Use advanced search/title search.
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Last edited by dmax; 03-11-2014 at 11:57 AM.
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