Getting multiple CEL's for the catalytic converters and cylinder misfires. Looking for threads that address these particular codes ie. 0431, 0421, 0300. 0303, 0306. I have a feeling that these are being caused from a vacuum leak and/or needing a reflash for the ECU.
View 3 RepliesI know the ignition coil are a big thing but I'm going to be buying this car this week and so I need to see how much less to offer the guy because of this issue. Is there anything other then the ignition coil that it could be? What's worst case scenario? And also would it be ok to drive it home about 60 or so miles with this going on? I'm guessing it's doing the misfires at idle.
View 6 RepliesI recently went to my mechanic after living with a very small leak right between the catalytic converters and the transmission for about 4 months. (it dropped a dime-sized mark about once every 5 days.) he said it was the rear output seal on the transmission but wouldnt touch it since there was no easy way to get to it and didn't want to drop the whole exhaust system. so off to vw dealership (wow, i guess a lot of people complained because they replaced everyone there and they're more friendly and efficient. my car usually sat there for 3 weeks before they even looked at it. (appointment mean nothing to those people.) but after dropping off my car i got a call within an hour telling me it was a cracked ventilation hose. they ordered the part and repaired it within a week (another first.) i also had them change the trans fluid and filter and the car ran smoother and a lot better and i checked for 2 weeks for leaks and none were there but within the past week, it's back and leaking the same way. the puddle is about the size of a penny so back to vw on monday.
View 1 Replies'05 GLX, 55k miles. Got an MIL light last week and it showed a P0421 code. Took it to the dealer and they replaced the right bank catalytic converter. That was last Friday. Fast forward to Weds. of this week. MIL comes back on and mileage drops noticeably, but power doesn't seem affected. Back to dealer, they end up replacing the other cat. Does this seem normal? I'm trying to figure out what may have led to this. Car is basically stock. I do my own oil changes (never overfill) and swapped out the spark plugs at 45k miles with Bosch Iridiums. [IMG] [URL] .....
View 4 RepliesThe vehicle is a 2001.5 Passat 4 Motion V6. 120,000 miles on the Passat.
The original Cats were replaced 1 month ago after a service station deemed them dead. When the vehicle failed emissions.
The codes were p0430 and P0420 and P411.
Before that about a year ago The O2 sensors were replaced.
After 2 new catalytic converters were installed. The vehicle is still throwing p0420 and p0430 codes.
I have a 2000 lc 1.5l ... I just rebuilt the motor machine shop work and all it Will start and run for 3 seconds and then die. If I hold the gas pedal it will run but sound rough and as soon as you let go it dies I have been able to get codes multiple misfires, misfire cylinder 1, misfire cylinder 2, and misfire cylinder 4 I have put brand new plugs (copper core ngk), wires coils, crank sensor, cam sensor, iac, tps, maf and the injectors all have new orings it also has ntk o2 sensors that might have 1000 miles on them...
View 1 RepliesI left the key on and drained my auxiliary battery(It was weak before) and when I jumped it it started and then shut off after ~20 seconds. I tried various different things and all I succeeded in doing was draining my HV battery from starting it so many times. So I disassembled the pack and recharged it and now it starts and runs but it is misfiring. It throwing 4 codes:
P0300: Random/Multiple Cylinder Misfire Detected
P0302: Cylinder 2 Misfire Detected
P0304: Cylinder 4 Misfire Detected
P1305: Ignition Coil 2 Primary Feedback Circuit
I inspected the igniters and plugs and they seem to be OK and I'm not sure where to look next. I'm not sure if the battery issue is related or not but I did replace the auxiliary battery.
I have a 2003 Mercedes c230 with low mileage 70000. This was its first season not garaged. About 2wks ago when very cold started abruptly to misfire badly at idle with poor gas mileage and modest loss of power. I got codes on OBD II for multiple cylinder misfires p0301-4 (all 4 cylinders). No other codes. Also the MAF and O2 sensors seems to be giving normal readings, and I cleaned the MAF sensor (didn't take off. cleaned through screen connected to air filter housing). 1 or 2 of the spark plugs seemed fouled as had black oily fuel on them and the O2 sensor voltage readings were consistently close to 0.9v (high meaning reading rich air/fuel right?). Changed all 4 plugs and swapped around ignition coils. Seems a little better but still misfire. O2 sensor voltage reads now consistently around 0.7v and the new plugs are dry but already blackened (indicating rich air/fuel I think).
View 11 RepliesSo I took a trip from Dallas to Florida, and on the way back my check engine light came on. The car shakes at idle, almost like it wants to take off. I drove it back to Dallas like that since the car runs normal on the high way. I got it scanned at autozone and the code said it had multiple random misfires. I'll be taking to the dealer in the morning, but what it could be? The car jumped over 50K during the trip hopefully the dealer will be nice and cover it.
View 4 RepliesThe catalytic converters are very hot and the one upper left, when looking into the engine, is even red. The engine runs less than 10 minutes a the converters become very hot. I think when the engine run another 30 minutes, then I have a firework.
And that's not all. If the engine is idling, it's everything o. k. But if accelerates over 2.500 RPM, then it smokes as a locomotive. The smoke is white, dense and it smells like unburned fuel.
So I ask, are the converters blocked and I need to change them, or is the engine before death?
I have a 2001 1.8T Passat. I bought it used recently and have had tons of problems. I have been getting a lean air code for some time now and I think I recently resolved that. I had to replace a few vacuum lines, MAF, exhaust flex pipe (it was broken), fuel filter and fuel pressure regulator. The car was still running bad and throwing a lean air code (Bank 1) so I finally changed the O2 sensor and I think that did the trick. Now every time I start the car I get misfires until is warms up. I get misfires on all cylinders along with the multiple misfire code.
View 5 RepliesMy daughter has a 2003 Passat Turbo. Two weeks ago it started to run like crap with a check engine light on. I pulled the codes and it said multiple misfires. My buddy owns his own shop and said bring it down. He pulled the plugs and the spark plug holes were filled with oil. He changed the valve cover gaskets and replaced the plugs. Still ran rough with low fuel pressure so he replace the fuel pump and injectors. Still runs rough, when he pulled the air intake off there was oil in it. Could this have happened do to the valve cover gasket? The codes still read misfires. He said the turbo was full of oil also. Could the turbo be bad causing it to run like crap? Can it be rebuilt? I really don't want to go to the dealer.
View 5 RepliesI have some rust building on the heat shield of my cats on my 2001 Nissan Frontier.. I had a weld done to keep it from rattling after replacing the OEM muffler. It there anything I can put on it to retard the rusting process on the shield and will that affect my emissions?
View 4 RepliesMy son-in-law has a 2006 Honda Accord with over 160,000 miles on it. About 8 months ago, the check engine light came on. The code said the down stream oxygen sensor was bad. He took it to a Honda dealer and they replaced the sensor and now the check engine light is back on with the same code. Can the catalytic converter have gone bad and can it have made the oxygen sensor go bad too?
View 5 RepliesMy Equinox had problems from when I bought it used at 23K miles. The evap hose recall was installed wrong and broke. The traction control went out and shut down my car in mid-drive (twice). Computer modules went bad. Timing chain had to be replaced. Then is was using 3 or more quarts of oil before reaching 3000 miles after an oil change, with no puddles on the ground. I received a letter from GM after it reached 120k miles, but the dealership was good enough to replace the whole engine anyway due to "problems" with this year and model. The catalytic coverters were bad at the time but not replaced though the "disappearing oil" from the bad engine seems to have caused that. What can I do to get this resolved without having to spend $1500-$2000 of my own money, that I don't have right now? (oh, one wheel hub assembly has just gone bad too)
View 5 RepliesI have recently picked up a 2005 F350 with the 5.4, which has 212k on it. Has a check engine light on for P0420 and P0430, as well as some kind of a 'ignition coil 'D'', I forgot which code it was as I deleted them at first to see which would come back. After driving it, the P0420 and the P0430 came back, but not the other, yet probably. I'm guessing the misfire due to the ignition coil caused the cats to go bad and the 420/430 codes, unless these codes are coincidental and the cats went due to high mileage.
Either way, I'm pretty sure I will need to replace the cats and was wondering what is the cheapest route. Should I get individual cats and have a shop weld them on? Should I go to Advance Auto parts or Auto Zone and get the whole pipe with the cats attached to them already and then get them installed? I anything will involve welding, I would have to bring it in to a shop. Also, in regards to the ignition coil misfire, what a good way to check which one it is?
I have a 2002 Elantra that has been in shop 3xs for same thing. The car says it is missfiring on 1 and I have changed wires, coil pack and spark plugs with no success.
View 2 RepliesI have an 02 Civic EX. Engine light has been on for over a year, runs just fine. Reading misfires on 3 cyl, and cat code. I have since: changed all plugs and coils, changed both front and rear o2 sensors....switched coils around to see if code misfires changed (yes).
I see this is a common problem but no one has a solution..? I'd rather NOT change the cat converter and pay for that only to find out the light stays on. Need to smog so I can sell!
Car threw a multiple cylinder misfire, changed plugs, wires, and then coil packs. Code keeps coming back.
View 12 Replies I bought this truck (2011 F-350 6.2l) used a month ago with 125000 miles on it. Of course the MIL light came on as soon as the ink dried. The codes read PO420 & PO430 and my local Ford Service said replace the cats. I said what is the cause of the failure, ford said here is a list of possible causes but it's not reading other codes so they don't know what caused the failure.
Well, I went ahead and replaced both catalytic converters, all four O2 sensors, and I replaced all sixteen spark plugs. Guess what, the MIL light is back on not 24 hours later reading PO420, PO430, and now PO620 and PO645. So I just went back to Ford today and all they did was cleared the codes and told me to call if the light comes back on. They said my PCM is up to date but why it's now reading GENCOM code or AC Clutch code.
I drive a 99 1.8t Passat with 90,xxx miles. Yesterday I felt the car hesitate/jerk a little when it's accelerated to 35-40 miles per hour. I've had this problem in my past and it was a cylinder misfire. I would bring it to the repair shop.
My question is: Can my car last about 1.5 weeks? My work is 20 mins away. I can definitely avoid the freeway.