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First time poster, long time browser. I have a 2003 Jaguar X-Type that my son has been driving for a couple of years. Its 90k+ miles and we have had to do a few things to it over the years and other things we have had to live with (such as the leaking oil pan gasket). A couple weeks back he came home with a blinking check engine light, I checked the codes and saw a misfire in one of the bank 2 cylinders. Long story short it was a bad gasket around the spark plug well and oil had seeped in and fouled the plug(s). I replaced the gasket, the plugs and even one ignition coil. After that, I don't remember if it was right away or days later but the check engine light came on and this time it was code P1647, bank 2 upstream O2 sensor. I replaced that and all the codes cleared. A couple weeks later, check engine light back on, this time with P0430, bank 2 cat efficiency issue.. And that is where I am..
First thing I thought to do was check the bank 2 02 sensors via live data, graph both the upstream and downstream. From what I read the downstream one should be somewhat flattened and not jagged up/down values all over the graph. Unfortunately I'm not able determine which is the PID for the upstream 02 sensor, these are my options: Available pids
I did graph the voltage of Bank1, Sensor 2 which I believe to be the downstream ones.
Is the above graph enough to indicate that the bank 2 (purple) catalytic converter needs to be replaced?
One other piece of information is there is a strong exhaust smell, both inside and outside the car. I initially thought this might indicate a vacuum leak, I even did a few shots of carb cleaner on a all the vacuum lines I could see but no rev.. But then I thought, if I'm smelling it its probably exhaust leak and not vacuum. Could that be another indicator of a failing cat?
Yeah I think unless anyone comes in and corrects me, I'll pull the trigger and just replace the cat.
I don't want to go the spacer on the O2 sensor route as I can defiantly smell some strong exhaust and the MPG is way down. Don't want to throw away money chasing this thing but at this point it seems the most reasonable next step.
I was chasing weird fuel trim figures and misfire codes and a lean burn condition on all 3 front cylinders for a few months. Then one day I took out the lower O2 sensor and looked inside the cat with a flexible camera, it looked like the meltdown at Chernobyl! The cat had collapse and was strangling the exhaust so the sensors were seeinf too little free oxygen in the exhaust which told the ECU to run the front bank injectors extremely weak which then caused misfires and power reduction at 3000 rpm. I bought a replacemnet cat from Magnaflow and changed them over a couple of weeks ago and it runs like new now. It took 7 hrs as you have to remove the undertray ( rusted bolts) and then drop the support beam under the radiator and ac condensor so you can and drop everything a few inches so you can wriggle the fan shroud complete with fans out. Then you have room to remove the heat shield, more rusted nuts so had to use an angle grinder, then you can get to the 3 nuts holding the cat to the manifold, also loosen the exhaust where it joins at Y piece under the engine. Refitting is the reverse but fit the short pipe to the bottom of the cat first as you can’t fit it when the cat is in place, don’t ask me gow I know! There were no mountings for the heat shield on the new car so I used stainless locking wire to hold it in place. The cat in your post looks to be correct for the job.
I'm going to order the cat and see what trouble I can get into. This car was my sons and will become my daughter's when she gets her license, still a few months out, so I have some time to figure out how to replace.
Bank 2 Catalytic Converter
