Hello there guys, after error codes P0171 & P0174 fixed by replacing the lower intake gaskets.. now I get P0430. Is this car ever going to be happy?
I have done everything, from plugs to o2 sensor, O rings, intake gaskets, air & gas filter.Why error codes come one at a time..you fix one and there comes a new one..
I would like your opinion and help again.
Thank you all..

 

I have read and reread Tech pubs, threads and have come to a conclusion, right or wrong, I have taken the conservative approach with these cars and found that after we fix the problems there is drive cycle issue that has to occur untill the there happy. EG. to test a oxy sensor it's warm up,drive 40 for 10 min.,60 for 10 min. stop idle stop,turn car off get out stand on your left foot spin around 3 times and your good to go.I'm exaggerating of course just to say drive the car a couple days and see what happens before ya say it isn't fixed,I hook up my scanner and set it to trigger on fault,run it for a few day(ya have to keep resetting it up but oh well)compare readings, reset code ea. time and sometimes more than not it's fixed, especially if it's multiple problems,ya got to keep chipping away untill they go away.If you shot gun it and they come back you haven't gained the knowledge of where to go.Dealers have the resources and incentive to shot gun I don't.How many times have you brought it in pay big bucks and it comes back. It's not the techs fault it's a time limit and pay and I don't blame them.I'm off my soap box now, just saying.

 

I keep getting the same P0340 code as well, Its the only code I have. I recently got the spark plugs changed and that got rid of my misfire codes from before. I was told to clear the code and let it run through its cycle but it still comes back so I'm assuming there is something else that needs to be done. I'm taking it to get checked out this weekend. Ill reply back what they tell me the problem is and if I get it fixed.

 

What does this mean?

OBD Code P0430refers to
Basically this means that the oxygen sensor downstream of the catalytic converter on bank 2 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
Symptoms

Possible sumptoms of OBD code P0430

You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.

Causes

Possible causes of OBD code P0430
A code P0430 may mean that one or more of the following has happened: The catalytic converter is no longer functioning properly An oxygen sensor is not reading (functioning) properly There is an exhaust leak

Possible Solutions

First, inspect for exhaust leaks. Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it. One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

I hope this helps.

 

What does this mean?

OBD Code P0455refers to
This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Symptoms

Possible sumptoms of OBD code P0455
You likely won't notice any drivability problems.

Causes

Possible causes of OBD code P0455
A code p0455 most likely means one or more of the following has happened: A loose or improperly affixed gas cap A non-conforming gas cap (i.e. not factory/original brand) Other leak or damaged piece in EVAP system

Possible Solutions

With a p0455, the most common repair is to: Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back. Otherwise, replace the gas cap, and/or Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary. I hope this helps.

 

Did you mean to say P0430?

 

I'm also getting the P0430 code (2002 2.5 a/t 116,000), and I was advised that I may have a vacuum leak. All the possible culprits--imt rings, brake booster hose, pcv hose, upper intake seals--have been replaced in the last 6 months. Only the lower seals were not replaced during a minor tune-up (plugs, coils, and upper seals) performed by an independent Jaguar specialist. The car struggles to remain idling to the point of almost dying (around 500 on the rpm) during cold starts (50F), prompting me to shut the ignition. It usually is able to maintain idle on the second attempt, but not without a few roughness. My understanding is that other fault codes (I'm using an Innova 3040 scanner) will appear whenever a vacuum leak is causing the engine to misfire. But it's been over a week, and only the P0430 is present (along with the P1000 readiness test). I also hear a noise coming from the engine bay, especially when backing out of the driveway (cold engine)--not a grinding, rubbing, or hissing noise, but more of a rattle (best description). Is it wise to have the car diagnosed to ultimately rule out a vacuum leak (which I strongly believe my car doesn't have)? If after confirming that a vacuum leak is not present, would it be safe to assume that I truly need a new catalytic converter? Any input will be greatly appreciated.

 

you more than likely have a bad catalytic converter

 

P0420 and P0430 are death codes for catalysts 99% (In Jaguar world) of the time. On an X-Type if it's bank 2 (P0430) they are not terribly difficult to do if it's a P0420 they are a huge pain in the behind. Remember, misfires kill cats! If the engine is experiencing any kind of misfire issue ensure it is repaired before spending big $$ on replacing the converters

 

here we go again. when techs/mechanics says it "may be a vacuum leak, 02's etc" theyre trying to give you a flase sense of less $$$ to be spent. the ecu looks at the downstream 02 reading and when they begin to mimic the upstream 02 readings as a % you get the codes. They usually start slowly(mine kicked its first p0420 6 months ago and hasnt returned) BUt it will eventually. Anything to produce a cleaner more efficient engine will improve your situation is air cleaner, repair misfires, vacuum leaks etc will improve the cats efficiency, but youre on borrowed time. a poor running engine is the hardest thing on cats, oh and BTW theyre covered for 8/80 on fed emmissions warranty

 

My car hasn't been misfiring, maybe because I don't give it a chance by shutting the ignition off when it starts to stall during cold morning start-ups. Would you attribute the stalling to a vacuum leak? i want to be able to prolong the life of the catalytic converter and maybe save the other one as well with your suggestions. And when it's indeed time to replace it, I hope it doesn't deteriorate sooner than it really should only because I never took care of the problem(s) that made it the original go bad in the first place.

Thank you for your insight and suggestions.

 

yes vacuum leaks can creat misfires as well as stalling because lean engines are harder to fire and when cold they need to be rich not lean. and if your stalling you do have issues(with the car)
ALSO REMEMBER THAT ANYTHING THAT REDUCES THE ENGINE EFFICIENCY PUTS MORE POLLUTANTS IN THE EXHAUST AND MAKES THE CATS WORK HARDER AND EXPIRE SOONER. THATS WHY MY DR SAYS SUGARS AND STARCHES OVERWORKS MY PANCREASE AND HAS LED TO TYPE II DIABETES IN MY CASE

 

Had the smoke test done yesterday to check for vacuum leak. Did find one between the manifold and throttle body, so gasket was replaced. Car does seem to idle better this morning on start-up, but fault code P0430 came back on within a few drive cycles. Scanner shows O2 sensor 2 in Bank 2 fluctuating between .15 to .75 versus .15 to .20 in Bank 1. Also, sensors appear to change readings fairly quickly. Does this mean that catalytic converter is really faulty? If so, I may have to resort to the spacer method for now at least until I have my smog inspection in July. Or I can either keep clearing the fault code or just ignore it completely, especially if it's not affecting the drivability or fuel consumption.

Btw, take it easy on the sugar/starch if you can help it :-)

 

Well, I spoke too soon. Car started to idle roughly and misfired again this morning (50F) at start-up with rpm in the low 500. Also noticed white smoke coming out of the tail pipe. Fault code P1316 (something about misfire exceeding emission) and P0300 (random misfire) briefly came on but went away upon getting back home (10-minute drive to auto parts store and back). Only the P0430, along with the P1000 remains. Sound that seems to be coming from the engine compartmentcwas more pronounced as I was backing out of the driveway and driving off. It wasn't as noticeable during my drive back. The short term fuel trims for both banks 1 and 2 was stuck at 25% while the 2 other fault codes were present. Long term ft's are about 9 (bank 1) and 7 (bank 2).

I'm not so sure now if it's only the catalytic converter that needs attention, or if there are other issues that I need to fix first. Any additional advise offered will be greatly appreciated.

P.S. Lately I've been adding a quart of oil in between 4000-mile oil changes just to keep the oil level from going below min mark. Would switching to synthetic reduce/eliminate my car's (116,000 mileage) tendency to consume/burn oil?