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Big Rod
Original Poster
3,716 posts
85 months
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I bought the car with this apparently having been replaced to cure the ECU warning lamp illumination.
Took it and had the errors reset and it just comes back.
Any common wiring issues I should maybe look at or are they prone to be faulty from the shelf?
Thanks in advance.
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SV8Predator
767 posts
34 months
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Why do you think the present faults are to do with a lambda sensor?
What codes are being thrown up?
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chancha
140 posts
88 months
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My initial thought was duff sensor even though it is new. However, could you get the codes reread to verify it is this?
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Big Rod
Original Poster
3,716 posts
85 months
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Already had the code reset and read again. P1647.
I guess the PO could be fibbing, but he swears he replaced it and his eBay history verifies that he bought one.
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chancha
140 posts
88 months
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Big Rod said: Already had the code reset and read again. P1647.
I guess the PO could be fibbing, but he swears he replaced it and his eBay history verifies that he bought one. Saw that too on his history. Am I wrong in assuming he has history for 2 sensors at 2 different times recently?
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Big Rod
Original Poster
3,716 posts
85 months
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No, I don't think so.
He initialy bought a diff locating bush, (there was a rattle from the back end. I heard it when I was taken out in it back in October.), which apparently the nugget that sold him the car told him was wrong with it. It wasn't.
Turned out to be the lower shock absorber bushes which he bought from ebay and replaced both.
The other ebay purchase, (besides the other odds and ends), was the lambda. I don't remember seeing two of them but I may be mistaken.
ETA:- Just checked and he only bought one on the 25th May.
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Jaguar steve
2,754 posts
79 months
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 P1647 is not on my list of Jaguar specific codes... Are you sure that's the right number? Might be worth buying your own OBD11 scanner. You can find one for under £20 that'll not only read the code but tell you what the fault actually is. There may be a code stored from a momentary maulfunction dating back months or even longer that is not relevant to the car now too. I'd get hold of a scanner, clear all the memory out and start from a known point in time and then run the car and see what happens.
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Big Rod
Original Poster
3,716 posts
85 months
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It's all been done already.
It's definitely that code and I stood and watched the guy at the garage reset the codes.
It's fine the first time you drive it after it's been reset but the next time you turn it on the EML light comes back on with the same code.
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Jaguar steve
2,754 posts
79 months
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You could swap the sensors over and see if the fault swaps over with them If it does - that's your problem, if not it's got to be something else.
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Big Rod
Original Poster
3,716 posts
85 months
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Jaguar steve said: You could swap the sensors over and see if the fault swaps over with them If it does - that's your problem, if not it's got to be something else. Good idea! Might just do that Steve, thanks. Out of interest, would a leaky CHG give the symptoms described?
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SV8Predator
767 posts
34 months
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It could be faulty sensor and the swapping idea above will help. But it could be something else that is causing the sensor to give a reading that is out of range (and thus generate the dtc).
So plug in a reader that will give live data and that may point you in the direction of the fault.
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Big Rod
Original Poster
3,716 posts
85 months
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SV8Predator said: It could be faulty sensor and the swapping idea above will help. But it could be something else that is causing the sensor to give a reading that is out of range (and thus generate the dtc).
So plug in a reader that will give live data and that may point you in the direction of the fault. Done already and the operator reckoned it was reading normally. (Granted he's not a Jag expert but he builds race engines from scratch.) The thing is that I'd expect the EML to indicate immediately an error is encountered but it seems to wait until I restart the car. Would this be 'normal' Jag' behaviour? BTW, the car passed emissions with the error showing so it seems everything is doing it's job. Very odd one. (To my mind at least) I think the swap over idea is the way to go.
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Big Rod
Original Poster
3,716 posts
85 months
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Just out of interest...
I found on my first proper long trip in the car that sometimes it feels a little hesitant to 'unleash its wrath'.
I immediately thought it'd be the traction control but the warning doesn't flash.
It's like it backs off intermittently during enthusiastic acceleration but doesn't feel like a misfire.
Would the lambda error cause this or should I be looking at something else?
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OneJag
44 posts
30 months
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Big Rod said: Already had the code reset and read again. P1647.
I guess the PO could be fibbing, but he swears he replaced it and his eBay history verifies that he bought one. Hi, You might like to know that my x308 xjr had the same fault code and the garage said it was Bank B upstream lamba sensor failure. Lamba sensor on the invoice was £120 (ouch!) for the part, not sure what the labour was but would guess an hour or so to diagnose, purchase and fit it. Cheers, OneJag
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Big Rod
Original Poster
3,716 posts
85 months
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Thank you. It's going in to have it 'fixed' on Thursday. In the meantime I'll be getting down and dirty with the throttle body, airflow meter and a can of carb cleaner as it's showing classic symptoms of those needing attention. Might just treat it to a new set of plugs too. FWIW, the upstream lambda sensor is a new one quite obviously so I reckon it's duff off the shelf or the connectors have got swapped at some point. We'll see. Lovong it so far except for the almost lethal tendency it has to tramline. It makes me clench a bit sometimes! 
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Big Rod
Original Poster
3,716 posts
85 months
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Plugs and fuel pumps changed and no better... ...Taken to a specialist and sticky ;egr' valve diagnosed and fixed. Apparently running like it came out the factory now. Get it back on Saturday I hope! 
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Big Rod
Original Poster
3,716 posts
85 months
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Oh BTW, it went to 'Premier Jaguar' in Paisley. Haven't met the bloke but he's fixed my car and I love him!! 
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