No power going to fuse 33 & 34. I'm having issues locating the correct relay for the HO2S.

 

Possible internal damage in the Front Power Distribution Fuse Box.

 

purchased used Front Power Distribution Fuse Box off eBay for $140, problem solved

 

Whats the part no for the front power distribution fuse box for a 2005 xj8l?

anyone know it?

thx

 

You should pull the number off your box, there are a few different versions.

 

Hi sixpackd,

If you download and install the Jaguar Electronic Parts Catalog, free from this forum, you can easily look up part numbers yourself.

There have been some part number supersessions, but the EPC shows these:

To VIN G34527: C2C20225

VIN G34528 to G49700: C2C28093

From VIN G49701: C2C33739


Compare the above to your car's VIN, then go to jaguarmerriamparts.com and search the part number to see if it has been superseded since the EPC was published and you'll know the most current part number.

If you're going to purchase a salvaged replacement, you should be able to use any of the part numbers shown in the supersession history, but you might as well use the newest part number shown to fit your car if available.

P.S. I haven't had to do this yet, but my assumption is that some of the common issues with the FEM may be repairable if you're so inclined.

Cheers,

Don

 

How did you remove the Front Power Distribution Fuse Box?

I unscrewed the 2 bolts holding it to the chassis, however the wiring has no slack, so I cant get under it to detach the wiring connectors.

Any suggestions?

thx

 

Unplug the easy connections first, this will provide slack to reach the others. I think there was 2 bolted power connections also.

 

have you checked fuses 33 and 34 in the engine compartment fuse box
You may have a bad relay if no voltage shows with the engine running.
Should be 12v+

 

I just replaced all the sensors, but the codes came back. What would it be?
belawidi

 

Hi belawidi,

To help us give you the most accurate replies, please tell us the year, model and engine of your Jaguar. It's a good idea to add this info to your signature so others don't have to ask.

Secondly, do you have the same exact codes as in the title of this thread? If not, please tell us the exact codes you have.

Cheers,

Don

 

Hi Don and everyone,
Special thanks to 03Xtype,

I don't work on the Jag myself. My mechanic told me, there's no reading from the O2 sensors. He won't troubleshoot the wiring though.

I'll share the 03Xtype's resolved case with him.

Thanks again,

belawidi
XJ 2004 VDP 4.2L
Rockville, MD

 

Only one will give any thing on mine is #2 if memory serves, nothing available on my scanner for the other three. But a friend of mine gets all four on his scanner.

 

Hello Jag Enthusiasts,

Following up with the warning amber light for O2 sensor, I replace the fuse box just like 03Xtype did. The warning light went away.

I got the part from UK via Ebay (used).

Thanks again for sharing the troubleshooting technique.

 

Outstanding, glad I could help.

 

There are a few ways to fix the issue

The first is to replace the fusebox.
If you are using a second hand part be prepared for the old relay to fail in the replacement. Using a new one is expensive but will give you longevity

The Second way is to fit an external relay
You can use standard automotive relays. Use a fused relay to make it easy. Pickup an ign trigger and power from the megafuse in the fusebox. Remove the O2 fuses and use a spade connector to feed power to them.

I did this initially when my relays failed. I used this option while waiting for a used fuse box. I then rebuilt both fuse boxes using the 3rd option

The Third way is to replace the relays. The are standard din type pcb mounted relays and cost only a few dollars each. I chose to replace all of them while I had the fuse box apart.

An interesting note is when you pull the covers off and remove the PCB you find its made by Learjet!!!

The hardest part is separating the 2 pcb's. To do this the best way is to use a soldering station as you need to remove all the connections on each side Failing access to one of these you can use a heat gun to do each side at the same time then clean it up with solder wick. If your not confident dong this you can cut the links and replace them with new wire latter on.
Once the 2 halves are apart its a simple matter of desoldering the relays and replacing them.

If you have gone the option of replacing the fuse box I would recommend you repair the old one. If you have used a second hand fusebox as it will fail again in the same way. Its best to have a refurbished part ready to go when that happens.

If you do a search I put up posts on using the external relay and repairing the fuse box a while back
Cheers
34by151

 

I have the same problem. I jumped 12V to the fuses and the CEL stays off. Of course, I'm having to hook the fuse up, then disconnect it five minutes later so I don't burn the sensors up, but if I can just get enough drive cycles to get it inspected this week I'll look into it later. At least now I know what's wrong.

 

Also got P1646. Swapped upstream sensors from right to left just to confirm its not sensors. Ordered front fuse box. Will report back when fix it.

 

Sorry, I forgot to followup on this. The used Front Power Distribution Fuse Box swap resolved the O2 sensor codes, and has not had any issues since.