Help with Limp mode issue.

Italteen3 · 07-30-2008, 07:16 PM

Not a big electronics/techy guy so I probably should have let shop install o2 sim from RR, but Im also stubborn. So I attempted it anyway and now I screwed up my car.

Installed the o2 sim first time no problem, but needed adjustment harness. Had RR send it to me and last week I got it. The night I got it I installed and went out for a drive. 5 minutes in got a warning light (looked up in my owners manual and it means engine temp high = limp mode). Got car home and RR tech on phone. He suggested it was a blown fuse and nothing to do with sim. I agree because I returned to stock, tripled check all my wiring and drove out again and got a limp mode even with oil temp under 200*.

When I went to look under hood again I found a yellow wire completely severed from the sensor on the passenger side of the AC filter box as well as one wire halfway split. Soldered the cut wire and added liquid tape to both wires and another limp mode.

Been without my car for a week b/c I get limp modes. Anyone else ever run into this dilemma?

Italteen3 · 07-31-2008, 10:41 AM

***BUMP***

e.n335 · 07-31-2008, 11:30 AM

Sounds like your installation & removal went wrong ... check whether your O2 sensors are working and being installed & connected to the correct place ...

scalbert · 07-31-2008, 11:38 AM

Not enough information. Are there still codes? What are the conditions the codes occur?

Italteen3 · 07-31-2008, 06:24 PM

Quote:

Originally Posted by e.n335

Sounds like your installation & removal went wrong ... check whether your O2 sensors are working and being installed & connected to the correct place ...

I know installation was fine because when the o2 sim was originally installed, without adjustment harness, everything was fine minus service engine light. DP's sounded sexy and car had great power. After adjustment harness the car went into limp mode, which I am thinking was attributed to clipped wires or blown fuse.

Scalbert only codes I got was from O2 sensors before/after problem. If I remember correctly P0230 & P0240.

scalbert · 07-31-2008, 08:56 PM

Please confirm as those codes are not O2 sensor related:

P0230 Fuel Pump Primary Circuit Malfunction

P0240 Turbocharger Boost Sensor B Circuit Range/Performance

Italteen3 · 08-01-2008, 05:03 PM

Quote:

Originally Posted by scalbert

Please confirm as those codes are not O2 sensor related:

P0230 Fuel Pump Primary Circuit Malfunction

P0240 Turbocharger Boost Sensor B Circuit Range/Performance

Jumbled the numbers up! P0420 & P0430. The only two codes I read.

scalbert · 08-01-2008, 07:36 PM

P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P0430 Catalyst System Efficiency Below Threshold (Bank 2)

Those O2 sims are not working correctly or are installed wrong. I would contact RR once again and discuss the codes.

Italteen3 · 08-02-2008, 11:31 AM

Quote:

Originally Posted by scalbert

P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P0430 Catalyst System Efficiency Below Threshold (Bank 2)

Those O2 sims are not working correctly or are installed wrong. I would contact RR once again and discuss the codes.

That is because I removed the sims after I got the limp modes. It is not sim related. What I am curious about is if a clipped sensor wire or blown fuse would cause the car to go into limp mode as it has?

scalbert · 08-03-2008, 08:22 AM

Quote:

Originally Posted by Italteen3

That is because I removed the sims after I got the limp modes. It is not sim related. What I am curious about is if a clipped sensor wire or blown fuse would cause the car to go into limp mode as it has?

Gotcha.

Yes, it very well could. The problem is that you are going into limp without any definitive codes. That means it is related to the codes set or there are non-OBDII codes stored. Know anyone at a dealer who can scan for all of the codes?

One other thought, although I am not sure it would show these symtoms, is if the sensor O2 sensors are reversed. Look down on the passenger side of the engine and tell us which sensor is in the front/rear downpipe The sensor with the grey cable should be in the front.

Italteen3 · 08-03-2008, 05:30 PM

Quote:

Originally Posted by scalbert

Gotcha.

Yes, it very well could. The problem is that you are going into limp without any definitive codes. That means it is related to the codes set or there are non-OBDII codes stored. Know anyone at a dealer who can scan for all of the codes?

One other thought, although I am not sure it would show these symtoms, is if the sensor O2 sensors are reversed. Look down on the passenger side of the engine and tell us which sensor is in the front/rear downpipe The sensor with the grey cable should be in the front.

Unfortunately I do not know anyone at a dealer

. WISH I did.

I do not think the actual O2 sensors are reversed/causing this problem, because I drove around with the DPs installed for a while without any issue. I am hoping to have a new fuse and sensor in by tuesday, so I will be eliminating one issue at a time. If none of that works, DP's come out and car gets towed to dealership.

Italteen3 · 08-06-2008, 06:24 PM

Got the fuse in today and will put it in later see if that is the problem or not.

07-30-2008, 07:16 PM	#1
Italteen3 Captain 59 Rep 765 Posts Drives: 135i JB Join Date: Feb 2007 Location: Somewhere..... iTrader: (0)	Help with Limp mode issue. Not a big electronics/techy guy so I probably should have let shop install o2 sim from RR, but Im also stubborn. So I attempted it anyway and now I screwed up my car. Installed the o2 sim first time no problem, but needed adjustment harness. Had RR send it to me and last week I got it. The night I got it I installed and went out for a drive. 5 minutes in got a warning light (looked up in my owners manual and it means engine temp high = limp mode). Got car home and RR tech on phone. He suggested it was a blown fuse and nothing to do with sim. I agree because I returned to stock, tripled check all my wiring and drove out again and got a limp mode even with oil temp under 200*. When I went to look under hood again I found a yellow wire completely severed from the sensor on the passenger side of the AC filter box as well as one wire halfway split. Soldered the cut wire and added liquid tape to both wires and another limp mode. Been without my car for a week b/c I get limp modes. Anyone else ever run into this dilemma?
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07-31-2008, 10:41 AM	#2
Italteen3 Captain 59 Rep 765 Posts Drives: 135i JB Join Date: Feb 2007 Location: Somewhere..... iTrader: (0)	*BUMP*
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07-31-2008, 11:30 AM	#3
e.n335 Moderator 270 Rep 4,481 Posts Drives: e93 ///M3 DCT, 07/2009 Join Date: Feb 2007 Location: Switzerland, ZH iTrader: (0)	Sounds like your installation & removal went wrong ... check whether your O2 sensors are working and being installed & connected to the correct place ...
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07-31-2008, 11:38 AM	#4
scalbert Major General 153 Rep 5,780 Posts Drives: '13 S4, '15 Q7 Join Date: Feb 2007 Location: Woodstock, GA iTrader: (8)	Not enough information. Are there still codes? What are the conditions the codes occur?
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07-31-2008, 08:56 PM	#6
scalbert Major General 153 Rep 5,780 Posts Drives: '13 S4, '15 Q7 Join Date: Feb 2007 Location: Woodstock, GA iTrader: (8)	Please confirm as those codes are not O2 sensor related: P0230 Fuel Pump Primary Circuit Malfunction P0240 Turbocharger Boost Sensor B Circuit Range/Performance
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08-01-2008, 07:36 PM	#8
scalbert Major General 153 Rep 5,780 Posts Drives: '13 S4, '15 Q7 Join Date: Feb 2007 Location: Woodstock, GA iTrader: (8)	P0420 Catalyst System Efficiency Below Threshold (Bank 1) P0430 Catalyst System Efficiency Below Threshold (Bank 2) Those O2 sims are not working correctly or are installed wrong. I would contact RR once again and discuss the codes.
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08-06-2008, 06:24 PM	#12
Italteen3 Captain 59 Rep 765 Posts Drives: 135i JB Join Date: Feb 2007 Location: Somewhere..... iTrader: (0)	Got the fuse in today and will put it in later see if that is the problem or not.
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