X Type / Engine Light / O2 Sensor / Code P1646 - FIXED
#1
X Type / Engine Light / O2 Sensor / Code P1646 - FIXED
Hi Thought I'd podt this again with a better header. Please help - Very new to this forum. I have a 2001 Jauguar X Type 2.5 V6 with 60,000 miles on it. The Engine light came on so I went to local garage which I have been dealing with for 20 years. The computer said fault code P1646/7 = O2 Sensor upstream Bank 1 which we replaced at around £68.00 etc. After 20 mins the light came back on. Local garage said to take to Jag dealer as they didnt want to start guessing. However I dont trust the local Jag dealer after hearing a friends recent horror story £5k worth of guess work!. Local garage did a vacuum check, eyeballed exhaust, checked hoses and all seemed to check out ok. Today I took it to another local garage where a friend worked who cleared the fault but after another 20 mins and upon first start it came back on.
For a few months prior I did have a noise which came and went coming from under the car when it was cold. I wouldt say it was drive train but sounded like a rev related rattle which has gone now ie since the light started coming on. Your thoughts on relacing one of the Cats which may not be doing its job and is sending gasses back up to trigger 02 sensor? All help greatly appreciated. John Mc
For a few months prior I did have a noise which came and went coming from under the car when it was cold. I wouldt say it was drive train but sounded like a rev related rattle which has gone now ie since the light started coming on. Your thoughts on relacing one of the Cats which may not be doing its job and is sending gasses back up to trigger 02 sensor? All help greatly appreciated. John Mc
#2
Hey John good to have you with us .....a great intro story, thanks for sharing, but sorry to hear about your issues
I really hope we can help you out and you enjoy your time here..... This is the new members section, you're unlikely to get the best help here....I've moved this to the X type area for hopefully better results for you my friend.
Good luck
If you like forums, I think you'll like it here! Some of the best guys around and a really great mix of information, camraderrie and fun
I've manually upgraded you to full forum access so you can better view the site...................................
The following users liked this post:
dbunt101 (07-31-2017)
#3
John, looking at the diagrams for your car, things are not looking to promising. Because you can replace an O2 sensor and the code doesn't clear, that would lead me to believe that you have good O2 sensors. This is where things turn ugly. That really leaves 2 other possibilities then.
Just to make sure you don't have the simple problem, check to make sure that fuses F38 and F42 in the engine bay fuse box are good. If both of these fuses blew, it is possible to cause the codes you are seeing.
If both fuses are good, then that leaves either a wiring issue between the O2 sensors and the ECM or the ECM is bad. This is where a detailed, hand over hand, inspection of the wiring harness will need to be done. Odds are, if you are going to have an issue, it will be in the passenger corner of the engine bay near the ECM. Otherwise, if the wiring harness looks good, it is looking like your ECM is giving you troubles. In certain cases, the plug on the ECM has gotten loose and a little bit of water will get into the plug and lead to problems like this. So, it could be something that simple. But, taking it to a professional shop to have them look things over is highly recommended before you start dropping big money on replacing the ECM.
Just to make sure you don't have the simple problem, check to make sure that fuses F38 and F42 in the engine bay fuse box are good. If both of these fuses blew, it is possible to cause the codes you are seeing.
If both fuses are good, then that leaves either a wiring issue between the O2 sensors and the ECM or the ECM is bad. This is where a detailed, hand over hand, inspection of the wiring harness will need to be done. Odds are, if you are going to have an issue, it will be in the passenger corner of the engine bay near the ECM. Otherwise, if the wiring harness looks good, it is looking like your ECM is giving you troubles. In certain cases, the plug on the ECM has gotten loose and a little bit of water will get into the plug and lead to problems like this. So, it could be something that simple. But, taking it to a professional shop to have them look things over is highly recommended before you start dropping big money on replacing the ECM.
The following users liked this post:
derbysatellite (07-30-2015)
#5
John, looking at the diagrams for your car, things are not looking to promising. Because you can replace an O2 sensor and the code doesn't clear, that would lead me to believe that you have good O2 sensors. This is where things turn ugly. That really leaves 2 other possibilities then.
Just to make sure you don't have the simple problem, check to make sure that fuses F38 and F42 in the engine bay fuse box are good. If both of these fuses blew, it is possible to cause the codes you are seeing.
If both fuses are good, then that leaves either a wiring issue between the O2 sensors and the ECM or the ECM is bad. This is where a detailed, hand over hand, inspection of the wiring harness will need to be done. Odds are, if you are going to have an issue, it will be in the passenger corner of the engine bay near the ECM. Otherwise, if the wiring harness looks good, it is looking like your ECM is giving you troubles. In certain cases, the plug on the ECM has gotten loose and a little bit of water will get into the plug and lead to problems like this. So, it could be something that simple. But, taking it to a professional shop to have them look things over is highly recommended before you start dropping big money on replacing the ECM.
Just to make sure you don't have the simple problem, check to make sure that fuses F38 and F42 in the engine bay fuse box are good. If both of these fuses blew, it is possible to cause the codes you are seeing.
If both fuses are good, then that leaves either a wiring issue between the O2 sensors and the ECM or the ECM is bad. This is where a detailed, hand over hand, inspection of the wiring harness will need to be done. Odds are, if you are going to have an issue, it will be in the passenger corner of the engine bay near the ECM. Otherwise, if the wiring harness looks good, it is looking like your ECM is giving you troubles. In certain cases, the plug on the ECM has gotten loose and a little bit of water will get into the plug and lead to problems like this. So, it could be something that simple. But, taking it to a professional shop to have them look things over is highly recommended before you start dropping big money on replacing the ECM.
Last edited by John Mc; 11-29-2011 at 02:07 AM. Reason: typo
#6
X Type Engine Light o2 Sensor etc
Hello to everyone. Good News. Its fixed. My own garage conceded defeat and referred me to another "New kid on the Block" Chris at CTH Auto Services based in Glasgow G13 4DJ. His reputation of having never been beaten is still intact! Chris nailed it down to being the other o2 sensor (RHS Lower) to that which the previous computers said it was (LHS Lower) For good measure he also replaced the other two upper ones all with Jaguar parts. Initially on driving it I found it to be a bit sluggish and a bit indecisive on gears but this has since got a lot better. Overall cost around £250.00 for parts so far and I have to go back and discuss the labour charges which I'm thinking will be around £150-£200.00. It is a lot of money I know but if you could see how good the car is looking you would understand why I was so keen to get it fixed. I hope it remains fixed as you never know with cars! I hope you all have a Great, Safe, and trouble free Christmas chaps and once again thank you all for being here. John.
The following 3 users liked this post by John Mc:
#7
Thanks for posting, and welcome by the way. Im a new member as well and I have learned a great deal here. Thanks for sharing your problem and especially the solution...I have the same code and I plan on changing the 02 sensors, now that I see what you did , I think I'm just going to change out all of them.
Thanks again and I'm glad you got the trouble sorted out!!
Thanks again and I'm glad you got the trouble sorted out!!
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