P1124 - long term fuel trim error-system lean
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Joined: Jan 2011
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From: RD2
Vehicle: RD2 Tib
P1124 - long term fuel trim error-system lean
Hello folks, my RD Tib threw this lean code at me and now it runs like garbage 
It cant idle steadily and stumbles at wide-open throttle. What can I do to help!
It cant idle steadily and stumbles at wide-open throttle. What can I do to help!
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Joined: Sep 2001
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From: Pflugerville, TX
Vehicle: 2000 Elantra
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This is from DTC > TIBURON(RC) >2001 > G 2.0 DOHC > Engine > Engine Control > DTC - P1123, P1124, P1127, P1128 > Diagnostic Procedure
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This is from DTC > TIBURON(RC) >2001 > G 2.0 DOHC > Engine > Engine Control > DTC - P1123, P1124, P1127, P1128 > Diagnostic Procedure
Thread Starter
Junior Member
Joined: Jan 2011
Posts: 28
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From: RD2
Vehicle: RD2 Tib
Oh wow, so this is not an ignition problem? It feels like the car has a bad misfire - it falls flat on its face in wide-open throttle and when idling it shakes like one of the plugs arent firing.
I was thinking about replacing spark plugs and wires (one of the wires is patched with electrical tape, who does that?!) but I guess I shouldnt bother replacing ignition bits if they arent the problem.
I've had a bad secondary O2 sensor for a while now, but its never made the car run this poorly before
I was thinking about replacing spark plugs and wires (one of the wires is patched with electrical tape, who does that?!) but I guess I shouldnt bother replacing ignition bits if they arent the problem.
I've had a bad secondary O2 sensor for a while now, but its never made the car run this poorly before
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Joined: Sep 2001
Posts: 10,795
Likes: 5
From: Pflugerville, TX
Vehicle: 2000 Elantra
aw, fail! Be sure the consumables are fresh and the known-bad parts are replaced before chasing wild geese! If you KNOW you have bad wires and a bad sensor, replace them! The third box down the troubleshooting matrix mentions oxygen sensors, even.
It's a system. Replace the components you know or strongly suspect are bad, reset the computer and see if the code comes back.
It's a system. Replace the components you know or strongly suspect are bad, reset the computer and see if the code comes back.
Thread Starter
Junior Member
Joined: Jan 2011
Posts: 28
Likes: 0
From: RD2
Vehicle: RD2 Tib
aw, fail! Be sure the consumables are fresh and the known-bad parts are replaced before chasing wild geese! If you KNOW you have bad wires and a bad sensor, replace them! The third box down the troubleshooting matrix mentions oxygen sensors, even.
It's a system. Replace the components you know or strongly suspect are bad, reset the computer and see if the code comes back.
It's a system. Replace the components you know or strongly suspect are bad, reset the computer and see if the code comes back.
Awesome Stocker, I'll do plugs and wires cause I'm sure the previous owner never did them (based on how the rest of the car was treated
) The O2 sensor is a little tricky, I suspect the secondary O2 sensor CEL is lit up because the flex pipe is torn and the O2 sensor isnt getting a good readingOn a side note, this little RD Tib sounds like its got a big-block V8 running wild cams - misfire and torn flexpipe makes an awesome sound
