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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Persistent ses under wot



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      05-26-2015, 12:29 PM   #1
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Persistent ses under wot

Looking for advice.
I have a n54 335is. With cobb tune.
When I'm in 3rd gear and wot I get ses and limp mode. Funny part is the turbos are still working fine in limp mode. I replaced the plugs and packs not even 4k miles ago. The codes I pull is like lambda prob before cat. What does that mean? The engine runs fine after ses light and power cycle removes the fash warning.
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      05-26-2015, 12:36 PM   #2
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Pre-cat O2 sensors.

Neil
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      05-26-2015, 12:41 PM   #3
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Whats the exact code?

Could be a failing primary o2 sensor.
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      05-26-2015, 01:30 PM   #4
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I'll get the exact code when I'm off work.
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      05-26-2015, 02:58 PM   #5
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I'll get the exact code when I'm off work.
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      05-26-2015, 04:06 PM   #6
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Quote:
Originally Posted by Jeff@TopGearSolutions
Whats the exact code?

Could be a failing primary o2 sensor.
Crazy thing is been having he same issue for like 2 months now can't figure it out and I replaced the 02 sensor. I usually get 2 codes p2c3d lambda probe before catalyst line fault and p2caa lambda probe before catalyst temperature
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      05-27-2015, 12:26 PM   #7
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Ok so weird thing was I assumed that was the code. Since I was getting it for awhile. I reset the ecu for service and my new codes are.
P29cf
P30ff
Always happens in 3rd at wot. I just replaced coils and plugs. Is cylinder 3 have a bad pack?
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      05-27-2015, 12:38 PM   #8
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Quote:
Originally Posted by Tatoon View Post
Ok so weird thing was I assumed that was the code. Since I was getting it for awhile. I reset the ecu for service and my new codes are.
P29cf
P30ff
Always happens in 3rd at wot. I just replaced coils and plugs. Is cylinder 3 have a bad pack?
Ok well the 30FF is a boost leak. So you'll need to track that down. It could be anything from a vac line, boost line, charge pipe / FMIC connections, to name a few.

As far as misfire, you can move the coil pack and see if it follows.

If the misfire follows it's the coilpack.

If it doesn't follow it could be fuel injector.

If your spark plugs have over 25,000 miles on them then you'll want to just replace all of them as they are over due and could cause misfires.
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      05-27-2015, 12:47 PM   #9
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Ok I'm going to swap cylinder 3 and 4 and see what happens. I replaced the cp recently to a bms one. It isn't straight on the throttle body. It has a slight angle and maybe it isn't fully on the o ring?
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      05-27-2015, 07:01 PM   #10
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Quote:
Originally Posted by Jeff@TopGearSolutions
Quote:
Originally Posted by Tatoon View Post
Ok so weird thing was I assumed that was the code. Since I was getting it for awhile. I reset the ecu for service and my new codes are.
P29cf
P30ff
Always happens in 3rd at wot. I just replaced coils and plugs. Is cylinder 3 have a bad pack?
Ok well the 30FF is a boost leak. So you'll need to track that down. It could be anything from a vac line, boost line, charge pipe / FMIC connections, to name a few.

As far as misfire, you can move the coil pack and see if it follows.

If the misfire follows it's the coilpack.

If it doesn't follow it could be fuel injector.

If your spark plugs have over 25,000 miles on them then you'll want to just replace all of them as they are over due and could cause misfires.
I'm getting misfires on the bank 1 cyl 1-3 and precat O2 codes and I replaced the O2 sensor still getting codes and inlet vanos code 2a82 comes up every once in a while and ses light is on. This damn car lol
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      05-28-2015, 01:44 PM   #11
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I just wish it ran problem free for at least a week. Only thing it does well is putting a smile on my face when I hear the spooling.
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      05-28-2015, 03:16 PM   #12
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Quote:
Originally Posted by Tatoon View Post
Ok I'm going to swap cylinder 3 and 4 and see what happens. I replaced the cp recently to a bms one. It isn't straight on the throttle body. It has a slight angle and maybe it isn't fully on the o ring?
It would cause a boost leak if it's not seated fully. I'd take it off and re-align it square. The connect at the throttle body is the most important when it comes to being square and seated fully.

Quote:
Originally Posted by Julian2485 View Post
I'm getting misfires on the bank 1 cyl 1-3 and precat O2 codes and I replaced the O2 sensor still getting codes and inlet vanos code 2a82 comes up every once in a while and ses light is on. This damn car lol
Have you changed the spark plugs yet?
How many miles on them?

Any tune?

What else was done to the car recently, modifications wise?

Clean you vanos solenoids. If that doesn't work to get rid of the vanos codes then they need to be replaced.
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      05-28-2015, 04:25 PM   #13
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Quote:
Originally Posted by Jeff@TopGearSolutions
Quote:
Originally Posted by Tatoon View Post
Ok I'm going to swap cylinder 3 and 4 and see what happens. I replaced the cp recently to a bms one. It isn't straight on the throttle body. It has a slight angle and maybe it isn't fully on the o ring?
It would cause a boost leak if it's not seated fully. I'd take it off and re-align it square. The connect at the throttle body is the most important when it comes to being square and seated fully.

Quote:
Originally Posted by Julian2485 View Post
I'm getting misfires on the bank 1 cyl 1-3 and precat O2 codes and I replaced the O2 sensor still getting codes and inlet vanos code 2a82 comes up every once in a while and ses light is on. This damn car lol
Have you changed the spark plugs yet?
How many miles on them?

Any tune?

What else was done to the car recently, modifications wise?

Clean you vanos solenoids. If that doesn't work to get rid of the vanos codes then they need to be replaced.
I changed my spark plugs and coil packs last summer . They have probably around 10k miles on them. I also did walnut blast and I'm running Cobb tune. I cleaned my vanos solenoids like 3 weeks ago. On cold start I'm beginning to smell fuel I'm going to check my plugs and see if the are black. Then I would be guessing leaking injectors
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      05-28-2015, 05:05 PM   #14
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Quote:
Originally Posted by Julian2485 View Post
I changed my spark plugs and coil packs last summer . They have probably around 10k miles on them. I also did walnut blast and I'm running Cobb tune. I cleaned my vanos solenoids like 3 weeks ago. On cold start I'm beginning to smell fuel I'm going to check my plugs and see if the are black. Then I would be guessing leaking injectors
Yep, sounds like a leaky injector.
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      05-28-2015, 05:11 PM   #15
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Quote:
Originally Posted by Jeff@TopGearSolutions
Quote:
Originally Posted by Julian2485 View Post
I changed my spark plugs and coil packs last summer . They have probably around 10k miles on them. I also did walnut blast and I'm running Cobb tune. I cleaned my vanos solenoids like 3 weeks ago. On cold start I'm beginning to smell fuel I'm going to check my plugs and see if the are black. Then I would be guessing leaking injectors
Yep, sounds like a leaky injector.
So I'm getting O2 pre cat codes haven't gotten the inlet vanos code in about a week and dealing with a leaky injector do you thing 1 of these could be setting the others off ?
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      05-28-2015, 05:54 PM   #16
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Quote:
Originally Posted by Julian2485 View Post
So I'm getting O2 pre cat codes haven't gotten the inlet vanos code in about a week and dealing with a leaky injector do you thing 1 of these could be setting the others off ?
I'd need the exact code.

Pre cats have several codes for either failure to communicate, mixture, temp, ETC.
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      05-28-2015, 05:57 PM   #17
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Quote:
Originally Posted by Jeff@TopGearSolutions
Quote:
Originally Posted by Julian2485 View Post
So I'm getting O2 pre cat codes haven't gotten the inlet vanos code in about a week and dealing with a leaky injector do you thing 1 of these could be setting the others off ?
Need exact code as there are a few pre cat codes.
P2a82 inlet vanos, O2 codes are p2c3d lambda probe before cat line fault, p2caa lambda probe before cat temperature. I changed the O2 and still get these codes. Plus the misfires on cyl 1-3.
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      05-28-2015, 06:24 PM   #18
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Quote:
Originally Posted by Julian2485 View Post
P2a82 inlet vanos, O2 codes are p2c3d lambda probe before cat line fault, p2caa lambda probe before cat temperature. I changed the O2 and still get these codes. Plus the misfires on cyl 1-3.
That code would indicate it has failed again. From some brief research everyone who had that code had to replace it again. It also related to the misfires.

In your case, since you're smelling fuel, you should pull spark plugs first. Check for fouling, if fouled look into that injector.

After that injector is ruled out and cat codes still present you may want to replace o2 again.

If replacement doesn't work I think you have me stumped.

O2 sensors are actually sensitive. I've had some fail just from installation. Biggest issue is how it's handled before it's delivered to you, IE if it were dropped.
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      05-28-2015, 06:26 PM   #19
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Quote:
Originally Posted by Jeff@TopGearSolutions
Quote:
Originally Posted by Julian2485 View Post
P2a82 inlet vanos, O2 codes are p2c3d lambda probe before cat line fault, p2caa lambda probe before cat temperature. I changed the O2 and still get these codes. Plus the misfires on cyl 1-3.
That code would indicate it has failed again. From some brief research everyone who had that code had to replace it again. It also related to the misfires.

In your case, since your smelling fuel, you should pull spark plugs first. Check for fouling, if fouled look into that injector.

After that injector is ruled out and cat codes still present you may want to replace again.

If replacement doesn't work I think you have me stumped.

O2 sensors are actually sensitive. I've had some fail just from installation. Biggest issue is how it's handled before it's delivered to you, IE if it were dropped.
Ok I'll try it in that order first. Is it possible that fuel is making the O2 sensor throw those codes ? Thanks I appreciate the help
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      06-13-2015, 07:28 PM   #20
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Quote:
Originally Posted by Jeff@TopGearSolutions
Quote:
Originally Posted by Julian2485 View Post
P2a82 inlet vanos, O2 codes are p2c3d lambda probe before cat line fault, p2caa lambda probe before cat temperature. I changed the O2 and still get these codes. Plus the misfires on cyl 1-3.
That code would indicate it has failed again. From some brief research everyone who had that code had to replace it again. It also related to the misfires.

In your case, since you're smelling fuel, you should pull spark plugs first. Check for fouling, if fouled look into that injector.

After that injector is ruled out and cat codes still present you may want to replace o2 again.

If replacement doesn't work I think you have me stumped.

O2 sensors are actually sensitive. I've had some fail just from installation. Biggest issue is how it's handled before it's delivered to you, IE if it were dropped.
Changed O2 sensor again and same codes comes up smh
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