Quote:
Originally Posted by Zzorro
98 with 175k kms. All original. No performance mods etc.
I have a durametric so can see codes. I have done my research on here and have O2 sensors on order.
My question: has anyone ever had this issue? And did replacing O2 sensors fix it?
My symptoms:
-CEL: duh. comes on and throws a raft of codes. It's infrequent however. Codes were as follows. NOTE: I can clear the P1117. It's persistent. I can clear the other codes without issue.
P1117 -Heating power 02S behind cat c bank 1
P1319 - Misfire emissions-relevant
P1313 - Cylinder 1 misfire emissions-relevant
P1314 - Cylinder 2 misfire emissions-relevant
P1316 - Cylinder 4 misfire emissions-relevant
P1317 - Cylinder 5 misfire emissions-relevant
P0410 - Secondary air injection system Cylinder (1-3) Signal implausible
P1411- Secondary air injection system Cylinder (4-6) Signal implausible
P1128 - Oxygen sensing range 2 Cylinder (1-3)
P1130 - Oxygen sensing range 2 Cylinder (4-6)
-Performance: minor sluggishness in performance until above 3000rpm. Then is comes totally alive (almost feels like turbo lag!).
-Performance: infrequently I get a major bogging at higher revs. Feels like a sudden loss of power and like fuel is getting cut. Lift off the throttle and the car idles fine. Lasts for maybe 5 seconds. Then fixes itself. Sometimes CEL comes on. Most times not.
-smells like it's running rich at idle.
What I've replaced so far: MAF (made a big difference), all coils and all plugs, fuel pump.
What I've looked at: tried to find a vacuum leak as research leads me to believe this is the culprit for these kinds of codes. Could not find one easily. Decided to tackle O2 sensors 1st after persistent code started occurring.
I'll post back here once I've done the mods to let others know what happens when I swap the sensors.
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The P1117 code is for the heating element in the O2sensor.
That heating element is triggered by the ECU as soon as you turn the key on.
The ECU is seeing that the circuit is not complete so it triggers the code.
Probably triggers it just by turning the key to the on position.
So you will not be able to clear that code and keep it cleared tell you fix the issue.
Since the P0410 - P1411 codes are SAI related I would fix the SAI issues before replacing O2 sensors other then the one with the P1117 code.
This is why:
The SAI system is upstream of the O2 sensors so any issues with the SAI "may" have an affect on O2 sensor readings. But the SAI issue will not affect the heating circuit of an O2 sensor because it is an electrical circuit powered from the ECU.
If you replace the O2 sensors before fixing the SAI you could still get bad O2 sensor codes.
Hope this makes sense
