If you don't have an OBD tool, disconnect battery for 2 mins. Car should be a bit lumpy after as it relearns fuelling, then smooth out.

I don't really recommend the above since you'll lose knowledge of what fault is stored. A very cheap £10 ish tool will read it and also can clear fault code(s).

If you do try batt off and light comes back, there's a fault.

 

JagV8 has posted many times about using the ELM327. He is right! I got one for $14 and it hooks to my laptop. So much data I am still learning all it can do. So much more than a simple code reader.

Data logging the fuel trims is just what you need to really see how the engine is running.

It's a bit of a learning curve but seems well worth it considering the cost and difficulty in getting to a Jaguar dealer.
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got the car looked at 1st thing this morn and it was bank 1 cat running below efficency.

We think this was because the car had been running rough for a little while.

Cleared the fault and drove for 30 miles or so and all good so far.

very pleased with the car especially in sports mode and found out also i have the cats suspension.

 

After the repair they should have cleared the codes - you'd hope they know to do it!! No more should have occurred so something is at the very least worrying.

 

all i can do is keep an eye on i suppose, car drives really well very quiet and smooth at all speeds and rev ranges, and goes when you want it to.

He did say it could be a lambada sensor?

 

Er.. lambda

It could be various things so be sure to get an OBD tool with live data since they're so cheap and at least check fuel trims.

 

thanks jagv8 you been great help, where can i get one of these obd? you got a Link for one possibly?

Darren

 

General Tech forum has a good thread.

 

Looks like they got it sorted out for you. That's great! I suspect, though, that you will continue to get the cat efficiency fault from time to time. Given the age on the car, the cats are likely at or near failure; especially given the running problems it's been through. Give it some time and see how it acts. Only time will tell.

Good luck!

 

just what i wanted to hear lol, but your probably right

any idea what it costs to have the cats replaced?

 

Hi, when my s type miss- fired it was a coil (number3) if I went over 40 mph it was really bad.