i know these are both catalyst codes. my car feels like it doesnt have any power past 4,000 rpms and im thinking that its because my cat is blocked and is screwing up everything. if i replace the cat do you think that will work?
View 1 RepliesI just bought a 2002 2.8L Passat 4Motion. On the way home, the check engine light came on. My friend lent me his generic brand diag tool to scan that check engine light. It came up with two codes. The first one was:
P0421
Warm Up Catalyst Efficiency Below Threshold (Bank 1)
The second code was:
P0431
Warm Up Catalyst Efficiency Below Threshold (Bank 2)
What this means or what I need to do to fix it? Is it a matter of cleaning something or replacing something? If it's something I can figure out, I'll do it on my own. Mistakenly, I erased the code and now the light is gone--thought I was deleting the code from the handheld unit. I can't open my hood.
Ok, so I scanned a 2006 Passat 3.6 4mo. I got a fault for the catalyst system, a fault for the AWD controller, and a fault for the Haldex pump. I'm guessing the catalyst code is for the oxygen sensors? What should be my next course of action on the AWD stuff?
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Address 01: Engine Labels: 03H-906-032-BLV.lbl
Part No SW: 03H 997 033 M HW: Hardware No
Component: P3.6-FSI-LEV2 G00 2370
Revision: --H11--- Serial number: VWZCZ000000000
Coding: 0000175
[Code] ....
2001 Prizm/Corolla - CEL is off, no trouble codes, all other monitors are ready, but not the catalytic convertor. No repairs since a new battery mid December. The smog guy (California) says that he can let another monitor go but not the cat; it costs him too many points.
Is this a converter in the early stages of failure (150,000 miles; some oil consumption)? Or is there another possibility?
It says warm up catalyst below threshold (bank 2). Is this just an o2? and is it upstream or downstream if it is? When I scan other cars at work it normally says system is too lean/rich for o2's.
View 2 RepliesMy prius was reset due to HV battery being replaced, I need to pass the NY State inspection and for that I have to complete a Drive cycle.
I have followed the instructions in the service manual for Catalyst, O2 and Evap test. I put the car in inspection mode and idle for few min to warm up then drive it for 10-20 min while monitoring it with techstream the Catalyst and O2 showed Pass and Complete the Evap needed the car to cool down for 6 hours so did that but I am not sure if I am ready to go in or not.
The COMPLETE does not show any more for the catalyst or O2 even but it does say PASS for all 3 . What does this mean?
why does it say incomplete for the test that I already passed?
I have been trowing a P0422 code which is main catalyst below efficiency.
I recently changed the rear o2 sensor and about 60 miles later the same code came back.
Logic dictates that the Cat is bad or there is an air fuel issue. No other codes have been thrown.
The car is a 1999 Jetta 2.0L AEG engine but it only has 51k miles on it. Would the cat go bad in 51k miles?
What else could I be looking at?
P0420 code. Catalyst Efficiency Below Normal (Bank 1)
This was the explanation I got from autozone. First question is how serious is this? The car seems to drive fine and normal, but I just purchased this car about a month ago. The light turned off after the guy at autozone plugged in the scanner. I am sure it will come back on again after some driving. Is it ok to drive with it on?
I was app. 10 miles from home & engine started missing & went into limp mode & yes the light flashed . I limped it home anyway & now have a PO430 code . # 2 spark plug died & caused this , danged plug didn't have a hundred miles on it since new . Replaced that plug & everything's fine except that code . Vehicle runs great . I've also read an 02 sensor could cause this code .
View 4 Replies2004 F150 5.4L V8 ...
P0420 Catalyst below threshold bank ...
O2 Sensors or Catalytic Converter ...
I've got a 2004 Prius with about 140,000 miles. Overall, the car has worked great, and I've kept up with regular service.
Several months ago, I started having bad misfiring of the engine. When I got it into the shop, it turned out to be two faulty ignition coils. The shop advised me to replace them all, which I did. Soon afterwards, however, the CEL came on, indicating a P0420 - "Catalyst System Efficiency Below Threshold Bank 1".
I have a 2001 jetta 2.0 engine with only 130k on it. Yesterday I replaced the battery and everything was fine but then today as I started it up to go to work I started moving and the check engine light was flashing for catalyst damage. I heard that sometimes coil packs will pop if you change the battery.
View 1 RepliesI'm working on a 2003 Jetta GLI 1.8t (MT and 140,000m if it matters). The CEL has been on for a couple of weeks because of an exhaust leak throwing a catalyst efficiency code. After I make this post I'm going to run down to the advance auto I used to work at & see if I can borrow the scanner to see if there's anything new, but as of right now I don't know. I'll update the thread if I find anything.
The car started yesterday AM perfectly fine. Started again when I left work around noon. No problems with the start, idle, acceleration.. it's all good.
3 hours later I tried to start it to go pick up my kid from school but it just cranked without firing and would not start. I took care of business with the kiddo and then started trying to pin down the problem.
1. Opened the door & listened for the fuel pump to prime.. No sound.
2. Noticed the dome light is on.
3. Checked ALL of the fuses on the side of the dash.. All are fine. Turned key to listen for secondary prime.. no sound.
4. Bought Fuel pump relay & replaced.. no change.
5. Cursed.. a lot
6. Bought fuel pump.. replaced.. no change.
7. Cursed a lot more.. and cried a little too.
8. Noticed the fuel pump was now priming with the key being turned, but still not when I open the door.. Dash indicates the known CEL, but now I notice that the EPC light is on too (this could be from all the fruitless cranking drawing down the battery charge)
9. Figured I'd throw in a new crank angle sensor cuz of the EPC.. no change.
10. Shot starting fluid down the intake.. didn't hit a lick.
I feel like I'm at a dead end.. It's acting like a bad ignition control module, but there's no such thing on a vw 1.8t.
P0420 Catalyst System below efficiency -- bank 1
I've had this code for a couple months trying to trouble shoot it. My gas mileage has been affected, as I'm getting about 23/24 MPG city/highway. I replaced the upstream 02 sensor with am aftermarket Bosch variety( I'm not sure why a non-OEM one would make a difference, as long it's working correctly).
My car has 253k miles, the cat doesn't rattle and I don't smell any rotten eggs or anything, but it has to be clogged or the 02 sensor I got was defective. My engine runs fine and I don't have any problems accelerating or decelerating. It may still be the 02 sensor since the gas mileage decrease is so significant, or it could be my converter is really clogged up.
I bought my Jetta almost a year ago, and I've been constantly replacing parts. Unfortunately, my engine misfired twice and the CEL has come on for P0420 which is inefficient catalyst. This is the only code being thrown. I've cleared it like 10 times, but it keeps popping up.
View 9 RepliesMy 2005 Dodge Dokota 4.7L V8 152,000 miles has an intermitent check engine light (CEL) code P0420 ('catalylst efficiency') that turns itself off.
1) 151,000 CEL on, code P0420, checked, cleared at dealer.
2) 151,948 CEL on, code P0420, checked, cleared at dealer (Cat Conv).
3) 152,200 CEL on, code P0420, checked, cleared at local auto parts store.
4) 152,597 CEL on. No checks.
5) 152,815 CEL turned off on its own
6) 152,849 CEL on. No checks.
7) 153,137 CEL turned off on its own.
Twice in this time CEL has came on soon after a fill up from near empty.
Engine runs fine, 18-19 mpg highway.
Have seen numerous on-line reports of other possible causes:
a) base engine problems (coolant or oil) -- coolant temp sensor
b) Air in leakage -- air systems or manifold
c) Lazy front O2 sensor
d) fuel pumps
e) timing or misfire
f) what else? - (gas cap, other...)
What to check first or categories to eliminate?
CEL and VSC came on so i ran the diagnostic tool and got this msg :
P0430 Catalyst System Efficiency Below Threshold (Bank #2)
what could it be? The car performs fine, no MPG decrease, no performance impact..
Have the EML on on my GS450h, read the fault codes and I have 2 fault codes that are identical (P0430). I cleared the fault codes and it stays off for a day, then as soon as I go above 60mph the next day, it comes back on again, the faults are stored and not current codes. I've not noticed any MPG loss or loss of power whatsoever! So am I safe to assume its not the catalysts? Only other thing I could think of is an o2 sensor gone bad perhaps? I don't want to spend money really as I'm about to sell the car for a more economical one for my 150miles per day commute to work! Just had all 4 wheels refurbished too which set me back a fair amount, now this!
View 2 RepliesHas around 173,000 miles, with a fresh cat installed a couple hundred miles ago. I was getting this code before, that is why I had a new cat installed. The code finally came back, and just recently I had to replace the crankshaft position sensor. After the sensor change, it was running great. The CEL came back on during a rainy day, I cleared it and was good for a few days. Then it rained again, and it came back. I couldn't afford a new OEM cat, I grabbed the best rated one I could from Amazon and had a shop install it. I know non OEM can be an issue, but I hope it is just an O2 sensor going bad.
View 2 RepliesGot this engine code error, how to proceed?
I have a '00 accent, just purchased a few days ago from a private party, when I bought it, I had a mechanic look it over, gave me the OK and said it passed inspection, no mechanical or obvious running problems with the car.
So I was driving around yesterday and the check engine light came on, took it to get the oil changed because I wasn't sure last time it was done, had the oil changed, light stayed on.
So I took it to auto zone to read the error code, was given this information. How to proceed?
I have a 2006 Subaru Forester with 95,000 miles on it. Earlier today the CEL (solid) and cruise (flashing) came on while I was driving. I believe it may have occurred as I was accelerating up hill. I filled up yesterday, so I tightened the gas cap when I stopped. On my way home, I stopped by my mechanic and they read the code; P0420 Catalyst Efficiency Below Threshold Bank was the code that was read. They reset the code for me but told me that the catalytic converter is what needs to be replaced.
My question: Could the light coming on be incidental (i.e., is it possible that it was a "blip" and my catalytic converter is okay?)? My mechanic said he thinks it is, and that my car should last me quite a bit longer. I am asking because I've put in a bit of money into the car of late and I'm wondering if I should just jump ship. I should say that the majority of the repairs are maintenance (e.g., brakes, tires).