Loss of power, no rev above 4500RPM, and fault codes P1120 and P1121
11-15-2009, 02:35 PM
#16
Burning Brakes
Thread Starter
For example, at the moment all is working fine.
11-15-2009, 02:38 PM
#17
Burning Brakes
Thread Starter
...you can use it to measure temps on either element of the cat. Get the High-temp version of the IR thermometer - one that goes up to 1500 deg or so. They have a laser aiming device so its easy to pinpoint areas to detect subtle or drastic temp changes. The high temp side should be the clogged side. I had this happen on one of my 993's.
Where can I get one, and how much?
11-15-2009, 03:23 PM
#18
Nordschleife Master
Join Date: Oct 2004
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Mine would be normal until they heated up then restrict the motor to 5k or so. If they overheated and melted, the ceramic element would become brittle and could be moving around inside. I'd keep driving if it's OK, see what happens...
11-15-2009, 07:49 PM
#19
Three Wheelin'
11-15-2009, 08:09 PM
#20
Race Director
I find it hard to understand why if the codes are related to the O2 sensors why the engine would not run above 4500 rpms. This sort of sounds like it is throttle related. However, e-Gas malfunctions generally result in the e-Gas being confined to limp home mode and engine speed limited to less than 4500 rpms.
If the codes do reflect a problem with the O2 sensors it could be -- and I write this with just a glance at some other posts -- something in the exhaust downstream of the O2 sensors that is playing havoc with exhaust gas flow. If the exhaust gas doesn't flow the O2 sensors may not stay hot enough and the error codes are the result.
Would I advise you to go back to the stock exhaust? No, not without more evidence the exisiting exhaust system is the problem.
Sincerely,
Macster.
11-15-2009, 08:13 PM
#21
Race Director
Seriously, I'll get the info I promised off to you Monday. As someone else mentioned site's been down for several days.
Sincerely,
Macster.
11-16-2009, 02:29 AM
#22
Burning Brakes
Thread Starter
It is possible. My info is for Porsches from 1996 to 2004. If you have a newer model car with a different and newer engine controller firmware image it is possible Porsche changed the meaning of the P1120/P1121 codes. All P1XXX codes are manufacturer specific and the manufacturer is free to change these whenever it wants to.
I find it hard to understand why if the codes are related to the O2 sensors why the engine would not run above 4500 rpm. This sort of sounds like it is throttle related. However, e-Gas malfunctions generally result in the e-Gas being confined to limp home mode and engine speed limited to less than 4500 rpm.
If the codes do reflect a problem with the O2 sensors it could be -- and I write this with just a glance at some other posts -- something in the exhaust downstream of the O2 sensors that is playing havoc with exhaust gas flow. If the exhaust gas doesn't flow the O2 sensors may not stay hot enough and the error codes are the result.
Would I advise you to go back to the stock exhaust? No, not without more evidence the existing exhaust system is the problem.
Sincerely,
Macster.
I find it hard to understand why if the codes are related to the O2 sensors why the engine would not run above 4500 rpm. This sort of sounds like it is throttle related. However, e-Gas malfunctions generally result in the e-Gas being confined to limp home mode and engine speed limited to less than 4500 rpm.
If the codes do reflect a problem with the O2 sensors it could be -- and I write this with just a glance at some other posts -- something in the exhaust downstream of the O2 sensors that is playing havoc with exhaust gas flow. If the exhaust gas doesn't flow the O2 sensors may not stay hot enough and the error codes are the result.
Would I advise you to go back to the stock exhaust? No, not without more evidence the existing exhaust system is the problem.
Sincerely,
Macster.
The last 2 days, it is working perfectly well. However it makes me nervous to
know it may be back; imagine to loose power suddenly, and be forced down from 6500 RPM to 4500 RPM, just as I needed it to get out of a trucks path,
or any similar passing maneuver- not good!
11-16-2009, 02:31 AM
#23
Burning Brakes
Thread Starter
Now, that is sincerely a sincere black mail on sincerely sexy Heather.
Sincerely Yours
Heather
07-07-2024, 12:36 PM
#25
Rennlist Member
I hope it was.
I think this thread went out into left field with a O2 sensor red herring.
I am having throttle gremlins with some constant and some intermittent codes:
(a 2003 C4S read by a Durametric) The throttle body was replaced with a Bosch unit 2 years /14k mi ago (P.O.)
Fault codes 07062023
08:00
P1120
Porsche fault code 117 - Throttle plate
P1122
Porsche fault code 431 - Throttle potentiometer 2
P1121
Porsche fault code 430 - Throttle position sensor 1
11:00 After a drive (and not developing full power above 3000 rpm...)
P1120
Porsche fault code 117 - Throttle plate
P1122
Porsche fault code 431 - Throttle potentiometer 2
P1138
Porsche fault code 430 - Throttle position sensor 1
P1514
Porsche fault code 540 - Throttle adjuster Lower mechanical stop
At 14:30
P1514
Porsche fault code 540 - Throttle adjuster Lower mechanical stop
P1120
Porsche fault code 117 - Throttle plate
P1138
Porsche fault code 430 - Throttle position sensor 1
I am looking for the Throttle Pedal Sensor: 996 606 115 00 to .02
(first searches NLA. From secondary suppliers:appx $1000)
I also looked up the Bosch number (on the unit) no joy.
Paul
