Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: C20det on 22 April 2015, 20:45:19
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My 3.2 is running of a cylinder or two as I had it plugged into a diagnostic computer and was coming up multiple cylinder misfire on 1 & 3 but not its not saying it's present also coming up 02 sensor bank 1 and catalyst level running rich
I didn't think this would cause it to misfire as such or would it
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Carry out pedal trick and post results... :y
030x codes are most likely oil or water contamination of the coil packs...
Clean breathers and replace Camcover gaskets or reseal scuttle as applicable :y
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Okay will give that a go see if it helps, also I got a copy of the codes that came up on the computer on print so will upload picture of that too if this helps :)
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Depends on the code reader, but pedal trick will tell you exactly what the ECU thinks is amiss :y
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I had a similar problem. Water in the coil pack caused by the windscreen not sealed properly after wiper motor replacement. Put the coil pack over the rayburn overnight, sealed screen, problem solved.
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It give me
P0130-8 02 Sensor Circuit malfunction (bank 1 sensor 1) - PRESENT
P0170-9 fuel trim malfunction (bank 1) - PRESENT
P0430-1 catalyst system efficiency below threshold (bank 2) - PRESENT
P0420-1 catalyst system efficiency below threshold (bank 1) - PRESENT
It's idling a bit rough with some minor vibration through the gear stick & hesitates when revving
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This was codes from a £1400 Autel Diagnostics Computer
I then erased codes & 02 Sensor (bank 1) was still present.
I didnt get a chance to do the paper clip test, I will try to do it tomorrow night if possible and report back
Cheers, Carl
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Pedal trick on the 2.6/3.2 and it's free ;D
0430/0420 are basically factory fitted, so ignore them.
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Done petal trick/test and give me the same codes as above
Although bought an 02 sensor today from my local motor factors and fitted it, EML was still on until I plugged the computer back in done a quick scan then erased codes & boom **Problem solved***
No more Rev hesitation or idling rough
:y :y :y
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Give it 50 miles...
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Why do you think that? You reckon it's not a complete fix ?
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Resetting the codes also resets the Ecu to a default map. This lasts for as long as it takes the ecu to learn the new live values...
That said, you didn't have a single misfire code, so the apparent 'misfire' could have simply been the ecu messing with the fuel trims due to a duff sensor...
But rest assured, the 0420/0430 will be back and will put the light back on :y
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So what fixes that if it comes back on then ?
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So what fixes that if it comes back on then ?
Moving the lambda sensors from in between the pre-cat and main cat, to post main cat.
These codes are generated because the pre-cats loose their efficiency. :y
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Thanks 👍
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And there's the EML back on lol ....arghhh >:(
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O2 sensor causing fuel trim malfunction on bank 1.
Replace O2 sensor bank 1 sensor 1
Genuine Bosch about £50 I guess?
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Assuming not a wiring problem of course.
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O2 sensor causing fuel trim malfunction on bank 1.
Replace O2 sensor bank 1 sensor 1
Genuine Bosch about £50 I guess?
:y
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Have you got one eye shut? ;D
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Have you got one eye shut? ;D
What you on about :-X :-X
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;D
Mr Bigtime has edited his post which said, how much are they? (02 sensors ) ;D
:P
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;D
Mr Bigtime has edited his post which said, how much are they? (02 sensors ) ;D
:P
Snitcher ;D ;D ;D
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I will check for any wiring problems & if not will proceed with genuine sensor as it was replaced by my motor factors probably cheap crap..
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Forgive me if I've got this wrong. But. . .
I would be doing what Al said in the first post before touching your O2 sensors. I.e. Look in to misfiring cis if it's dumping fuel in and there's no spark, the O2 sensor will pick that up as a too rich code.
Just my initial thoughts and again, sorry if that's wrong. . . . Don't want to incur dtm's wrath again ;D :-[
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I've yet to come to a 3.2 Ecu on a new to me car, that didn't have a historic miss fire code in there somewhere. It's not showing a misfire on the second reading by all accounts. So codes cleared and what's returned...?
Present O2 sensor. Present fuel trim. All bank 1.
As said ignore 0420 0430 as normal for now. But the pre cat brings the light on hiding everything else to the driver. Fuel trim would be good to check on live data as if it's over +/-25 then it will struggle to run.
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Ok then fair enough Chris. I clearly missed the bit where codes were cleared then re read. :y
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Ok then fair enough Chris. I clearly missed the bit where codes were cleared then re read. :y
Er well no it's not been expressed, but the codes aren't present in the second list.
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:y :y :y
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Just checking I'm correct here bank 1 sensor 1 would be the pre cat sensor from cylinders 1, 3 and 5? Am I right?
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Just checking I'm correct here bank 1 sensor 1 would be the pre cat sensor from cylinders 1, 3 and 5? Am I right?
Yes you are correct,bank one sensor two is the downstream sensor which throws the 0420/30 codes,that's the sensor that needs moving to after the main cat.
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Correct
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Okay so il move that sensor to after the cats but will this solve my problem? Take it I still need to replace the pre cat sensor then with a genuine Bosch.
Are these sensors all the same or different? Just I was reading that the pre cat sensors are usually used for fuel control & main catalytic converter oxygen sensors for reading amount of 02 used?
I'm confused abit with these as maybe I've got the wrong sensor as I just asked for an 02 sensor at the motor factors.
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Ignore 0420/30 for now. That's sensor 2.
You need to fix sensor 1.
There are no cats between the engine and sensor 1. So sensor 1 is purely concerned with exhaust gas created by the fuel/air mix. It's reporting the fuel air mix incorrectly, so the ecu is trying to "trim" the mixture by adding or subtracting a % to the normal injector timing duration. So your getting a fuel trim code as well.
Sensor 2 is AFTER the much smaller pre cat. So it's expecting to see some cleaner gasses (pre cats are there related to cold starting emissions in the States I think. Whatever, it was a crisp idea.) But because the PRE cats are old/small/have an exceptionally hard life the catalyst wears and becomes inefficient, as the codes says. Moving sensor 2 to a location AFTER THE MAIN cat, restores the efficiency sensor 2 expects to see. So 0420/30 codes disappear, the light stays off, and you can then see when the light comes on for a "genuine" fault, like a dodgy O2 sensor or a misfire etc....
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As Webby says though, it can do no harm to check (via the pedal trick, not a lesser known code reader, however expensive) there are no misfire codes listed.
I would advise doing so before purchasing a new sensor as that could complicate matters, as the codes "could" be a result of the miss fire, not other way round. I don't think so, as the ecu shuts down a misfiring cylinder on the drive by wire cars. But I don't want to waste your money advising a new sensor if it's not needed due to a diagnosis potentially based on half the available info. :)
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Okay thanks I will try moving sensor 2 to a location after the cats, and see what the pedal trick says after I do so
Cheers guys
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I also tried changing bank 1 sensor 1 with bank 2 sensor 1 to see if it would bring up sensor 1 on bank 2 was just trying to rule out if it was a faulty sensor but still reading bank 1 sensor 1, so hopefully at the weekend I will get sensor 2 moved location after the main cat my friend is good with a welder so should be no problem
Is it possible for me to post pictures being a newbie?
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Think posting pictures is no problem.Only thing you can't post until you hit at least 250 post count are for sale ads.
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Hi guys
So on Sunday night I relocated bank 1 sensor 2 to after the main cat and started her up but light was still on, I then reset it with the computer in work and drove it for about 70miles & just there tonight the light had came back on again but I have to say it was under abit of pressure I was driving up a bit of a hill in 3rd around 4000-4500rpm when it came on & now I'm getting these codes.
0130
0150
0430
0120
0170
0300
0201
Any ideas
Thanks, Carl
P.S I took a few pictures of my sensor relocation but I don't know how to upload photos yet 😏
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Seek and ye shall find...
http://www.omegaowners.com/forum/index.php?topic=90594.0 ::)
Don't know what you've done, but you've really pissed off the car :-\
In no particular order...
Bank 1 O2 sensor 1
Bank 2 O2 sensor 2
Random multiple misfire
Throttle pedal position sensor
Bank 1 fuel trim
Cylinder 1 fuel injector
Bank 2 cat efficiency
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I really I'm confused now lol, as I just got into the car after work & the EML light wasn't on??
I just put in onto the computer and was bring up
Random multiple misfire
Cylinder 3 misfire detected
Cylinder 5 misfire detected
But they say "Not Present"
Mmmm Strange one
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What code reader? Pedal trick is more reliable than "My Naff Code Reader"...
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2014 Autel MaxiSys
&
These codes:
0130
0150
0430
0120
0170
0300
0201
Was from the pedal trick but now the eml light is out 😏
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Bulb blown...
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Right, would that cause this you think
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Bulb blown...
...would give a code. And even my naff code reader has an activation test for it.
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Light back on again
Reading following codes from pedal trick:
0130
0560
0430
0130
0130
😕
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0130 you know about.
0430 you know about.
0560 could it be the battery went a bit flat while code reading with ignition off?
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Mmm dunno strange one as The battery seems fine no problem with starting etc and I was just driving along at a steady pace when the light came back on 😓
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That's the 0430 that's done that... 0420 will be along shortly :y