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Discussion Starter #1 (Edited)
Hey guys, wonder if anyone can help.

Going round in circles here.

Have a 2008 e92 325i aka 3.0.

I occasionally get a slow to crank/start, not often
Smell of fuel on first start.
Code P2188 and many others. Seen a purge valve FAIL on one of my obd checks just says Value 92.16, minimum 436.9, Maximum 436.9, result Fail.
All the usual, P2B08, P2B07, P2B29, P29E0,
Inpa basically says the same.
Car drives fine other than a high mpg.
Black tail pipe.
Does throw an EML but i aint seen it for days now after clearing.

Obviously the codes says too rich, o2 sensor, but i am led to believe this can be the injectors, HPFP, coils etc.

But no misfire codes to speak of, car drives ok.

Thought was an injector/s but now i aint too sure.

Read about purge valve, o2 sensor and maybe even Maf.

Would the injectors always cause a misfire and EML, because i aint seeing any of that often, no misfires.

Am checking the purge valve tomorrow also, but would any or all of these cause same symptoms other than injectors.

Dont wana go down the process of elimination again with another BMW been there before.

Its been into a BMW specialist also.

Its doing my head in now.
 

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Discussion Starter #2 (Edited)
Just ran Inpa agaian, did a check on o2 sensors, bank 1 , Lambda Sensor voltage after cat is running over the voltage slightly in the red but defo over 0.9v

Surely this is the issue and not an injector, would the injector cause this or solely the o2 sensor being faulty.

Cleared the P2188 code, and came up straight away pretty much. When i cleared the P2188 fault creating an open loop, within seconds it reverted to closed flagging the fault.

Watched the bank 1 downstream after cat go as high as 0.97, while the bank 2 was below the thresh-hold of 0.9v never went over. Upstream is fine. Pretty much match each other

Could the injector be forcing the downstream o2 sensor to ping a voltage over the thresh-hold of 0.9v, or would it be the o2 sensor creating this.

If the upstream closer to the injectors etc are reading ok, and the downstream are further away it suggests the o2 sensor is faulty, or else the upstreams would be the first in line for bad readings.
 

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Can’t help with much of this but I do know that leaky injectors cause the car to run very lumpy on a cold start, once it warms up it will be nice and smooth.

Let it sit overnight then start up and listen to the idle. If it’s shaking or shuddering and hunting for revs then could be injectors.
 

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Discussion Starter #4
well am pretty sure its the downstream sensor now.

Checked as much as i could. Thorough INPA scan, all leads to o2, pulled all the plugs bone dry no sigh of fuel. The fault is saying Bank 1. Bank 1 plugs are fouled but only sooty no fuel or wetness.

Did the open and closed loop test, again all points to O2 sensor. When checking on INPA, the O2 on bank 1 downstream reads well over 0.9v while the bank 2 downstream stays within the parameters. Obviously both should read roughly the same, but the bank 1 pings way too high. Codes for O2, mixture, heater fault on sensor etc.

There could be another variable to affect the O2 but after pulling the plugs am pretty convinced its not an injector.

Got to start somewhere so gona do the bank 1 downstream, only thing is i priced an O2 sensor and was quoted but on checking the part number have noticed its a Denso, i would prefer the Bosch, anyone had any experience with the Densos cause i aint to sure about putting them in.
 
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