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  #1  
Old 07-22-2018, 03:34 AM
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Randomly enters into limp (?) mode- rough idle

My X5 has been running pretty smoothly the last 6 months. I don't drive from the often (once a week ~10kms) and have done a few long trips (300 kms).

However this week- it seems to randomly to into "limp" mode. Idling becomes rough, and accelerating is patchy.

It normally only happens at ignition, and often turning it off and on gets rid of the problem (car runs fine, no errors get reported/ODBII is clear).

However, today it happened while driving.

What could be triggering this limp mode?

It possible I have a temperamental o2 sensor triggering it?

Work I did with in 12 months- CCV Replaced, alternator, disa valve.

ODBII tells me:
P0115- power train O2 Heat sensor
P1349 P1351 P1352- tap for multiple descriptions
P0300- random misfire detection.
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Last edited by mcfee03; 07-22-2018 at 07:05 AM.
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  #2  
Old 07-22-2018, 09:12 AM
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Check your codes again and I would bet that your misfiring cylinders change after clearing... i.e. 1,3,4,7 to 1,3,5,8 or whatever.

I'm not sure what causes it but I've had it happen also, but I think the cylinder changes is caused by the temperature O2 sensor error. As to if something else causes the O2 temp sensor fault I don't know but my mechanic will come by the compound later in the week and I'll ask him then, but if you find out I'd be very interested in the cause.

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Old 07-22-2018, 10:09 AM
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Randomly enters into limp (?) mode- rough idle

The 02 heat won't cause limp mode my car has has that problem for 7 months.

Go-to on random limp mode is bad plug. Did you replace the plugs?

I had three of those events over about a year. "Misfire with fuel shut off"

Wife's car had it bad: couldn't drive more than about 20 miles at the end without misfire / limp.

Changed her horrible looking plugs and back to normal. I then realized probably why I would get the same exact error occasionally so I changed my plugs as well.

(No misfire since and bonus better mpg)
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Old 07-22-2018, 10:25 AM
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I had a similar issue with occasional rough idle and misfires. Turned out to be a torn intake boot. I got the yellow cog warning light and it downshifted harder when it occurred.
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Old 07-22-2018, 05:15 PM
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Quote:
Originally Posted by mcfee03 View Post
...

Work I did with in 12 months- CCV Replaced, alternator, disa valve.

...
Been wondering, mcfee03, did you ever find that missing DISA pin...?
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Old 07-22-2018, 06:31 PM
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I think the answer was established: no I'm betting it's on the foam pad under the engine.
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Old 07-22-2018, 08:35 PM
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Quote:
Originally Posted by andrewwynn View Post
Go-to on random limp mode is bad plug. Did you replace the plugs?
No, I didn't replace any of the plugs. Would you recommend replacing all at once? Is there a way to examine them to see their 'condition'?

Any particular brand/model you'd recommend?

Quote:
Originally Posted by wpoll View Post
Been wondering, mcfee03, did you ever find that missing DISA pin...?
Na, never found it. Spent like 4 months looking for it on/off (and not driving) including a wire camera, taking the intake out, removing all the pistons. FWIW did take it to a local mechanic too, who checked over my work and said it was running great

Some pretty huge steps given I'd never done any mechanical work before!
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Last edited by mcfee03; 07-22-2018 at 08:44 PM.
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Old 07-22-2018, 10:01 PM
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Randomly enters into limp (?) mode- rough idle

NGK Platinum. OE

Code will usually repeat on a cylinder. Pull that plug and one without a code and compare.

When I did wife's car, the trouble cylinder plug was wet and gross.
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Last edited by andrewwynn; 07-22-2018 at 10:07 PM.
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Old 07-23-2018, 05:45 AM
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Same happened to my friend and after several trips to the dealer it turned out to be a bad battery....worth checking it if you haven't already.

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  #10  
Old 07-23-2018, 09:52 AM
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Quote:
Originally Posted by mcfee03 View Post
My X5 has been running pretty smoothly the last 6 months. I don't drive from the often (once a week ~10kms) and have done a few long trips (300 kms).

However this week- it seems to randomly to into "limp" mode. Idling becomes rough, and accelerating is patchy.

It normally only happens at ignition, and often turning it off and on gets rid of the problem (car runs fine, no errors get reported/ODBII is clear).

However, today it happened while driving.

What could be triggering this limp mode?

It possible I have a temperamental o2 sensor triggering it?

Work I did with in 12 months- CCV Replaced, alternator, disa valve.

ODBII tells me:
P0115- power train O2 Heat sensor
P1349 P1351 P1352- tap for multiple descriptions
P0300- random misfire detection.

P1349 BMW - Misfire Cylinder 4 With Fuel Cut-Off

P1351 BMW - Misfire Cylinder 5 With Fuel Cut-Off

P1352 BMW - Misfire During Start Cylinder 6

Base on what you wrote and the codes you posted, you have a misfire(s) with injector cutoff. Restarting the engine just reset the misfire counter back to 0 and the injector(s) that was turned off by the computer is now back on. Could be a bad plug(s) or a bad coil(s). It would be cheaper right now to just replace the plugs if they haven't been done recently.

Other things to look at because you have 3 cylinders that are misfiring is for an Intake vacuum leak or a Faulty Camshaft Position Sensor.
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Last edited by upallnight; 07-23-2018 at 10:00 AM.
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