Prius (2004-09) :: CEL On / Code P0420 / Catalytic Converter Threshold Below Efficiency
I checked out a 2006 Prius yesterday a guy is selling. It had the CEL on (not sure why somebody would try and sell a car with that, but anyway). He said that it's because they get gas at a station that consistently doesn't tighten the gas cap enough but by the time the tank is down to 1-2 bars the light always goes away. Although I don't doubt his story, I absolutely doubted the cause. So I took it to get the code pulled and it was P0420, which is catalytic converter threshold below efficiency.
View 15 RepliesHonda - Accord :: 2002 - Catalytic Converter Is Not Operating Within The Efficiency Range
The Honda dealership read the check engine light code on my Honda 2002 Accord, that said the catalytic convertor is not operating within the efficiency range(plus the converter has a rattle in it...it is not the heat shield as it was taken off years ago). They said it was too expensive to have fixed at the dealership and to find an independent repair shop to replace the converter.
They warned me to not get the cheap universal converter as the check engine light for the converter would come back on and stay on. They said get a more expensive one but would not give any specific brand or price range and said it SHOULD keep the check engine light from coming about the converter.
I have an independent shop and they agreed about never using an universal converter. However when I press them about the $270 converter they would put on would keep the check engine light for the converter from coming on, they hesitated in assuring me it would not come on.
Honda Accord converter can be replaced with an after market converter, what did it cost, and did it keep the check engine light for the converter from coming on?
Passat (B5) :: 2002 - Cat Warm Up Threshold Low Code / O2 Sensor
I have a 2002 GLX Wagon 2.8 30v, and was getting Cat warm up threshold low code, on the driver side due to the cat being bad. As a temp fix I decided to use spark plug haulers to gap the sensor. When I removed the O2 sensor I wiped the dirt off with a paper towel, which was clean and dry. I put the sensor back on, but now I am getting 4 codes which won't go away. p0036 p0056 p0141 p0161. These are O2 heater circuit codes both bank 1 and 2. I did not touch bank 2 so I don't know how I could have caused this error. I tried to take off bank 2 sensor but it is really stuck on there.
View 3 RepliesTouareg :: P0420 Bank 1 Efficiency Below Threshold Code Keeps Coming Up?
Recently I pulled code P0420, AKA Bank 1: Efficiency Below Threshold.
To start from the beginning...several weeks ago my EPC light came on so, like most educated consumers I decided to buy a vag-com. I pulled the codes and got both the Bank 1 and Bank 2 efficiency below threshold codes (p0420, p0430). I reset the light and literally within 3 minutes the EPC light came back on only this time just Bank 1.
So I drove around again for a week and the check engine light came on this time, back to Bank 1 and Bank 2. Whether trying to replace the spark plugs will possibly fix the misfires, its Cat Converter replacement or possibly just replacement of 02 sensors. I have been reading mixed responses.
FYI I use synthetic oil and chance the oil every 7500-9000 miles, have 89,000 miles and have never changed my spark plugs.
Maintenance / Repairs :: Code PO430 / Catalyst Efficiency Below Threshold
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 RepliesGolf IV / Jetta IV :: 1999 / 2.0 - Code P0422 Main Catalyst Efficiency Below Threshold
Has 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 RepliesSubaru - Forester :: 2006 - Catalyst Efficiency Below Threshold Bank Code P0420
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).
Golf IV / Jetta IV :: Error Code P0420 - Catalyst System Efficiency Below Threshold
On my 2002 (AVH) 2.0L 4cyl Jetta I have a persistent P0420 error code: "Catalyst System Efficiency Below Threshold"
I changed the oil, cleaned the Mass Airflow Sensor, replaced the coolant, thermostat, and coolant temperature sensor. But it's still showing up.
OBDII says it could still be:
A damaged or failed oxygen sensor (HO2S)
Downstream oxygen sensor (HO2S) wiring damaged or connected improperly
Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe
Retarded spark timing
The oxygen sensors in front and behind the converter are reporting too similar of readings
Leaking fuel injector or high fuel pressure
Cylinder misfire Oil contamination
Passat (B6) :: CEL Code P0430 Catalytic Converter Related
It came on 2-3 miles after a cold start. 3.6 with 137,000 miles. What's next? First car I've owned that uses very little oil between oil changes.
View 1 RepliesAccent LC (2000-05) :: Code P0422 Keeps Popping Up - Main Catalyst Efficiency Below Threshold Bank 1
I have a 99 Tiburon 2.0 DOHC that I cant seem to get through emissions. The code, p0422 main catalyst efficiency below threshold bank 1 keeps popping up even after replacing the cat converter (twice) and replacing both 02 sensors. What else could be triggering this code and how to fix it?
View 2 RepliesToyota - Camry :: Check Engine Light Code - Catalyst System Efficiency Below Threshold
My 1999 Camry with 169700 miles has this 'check engine light' code: "Catalyst system efficiency below threshold". We have a mechanic we trust so we'll bring it to him this week. We spent a couple thousand fixing this car about two years ago and I'm not sure it is worth doing that again. Carmax offered us 1200 for it around this time 2012.
View 17 RepliesFord - Explorer :: Check Engine Code P0420 - Catalyst System Efficiency Below Threshold
Book says "catalyst system efficiency below threshold (Bank 1)".. Is it just based on mileage or an actual bad O2 sensor or other bad system component?
View 14 RepliesFord - Ranger :: 1999 - Check Engine Light / Catalyst Efficiency Below Threshold Fault Code
99 Ford Ranger 4-cyl. Check engine light is on; pulled fault code: "catalyst efficiency below threshold, bank 1." Cat converter is new as is rest of exhaust, o2 sensors are new, and its been recently tuned up.
View 6 RepliesGTI 337/20th Anniversary :: Converter Below Threshold Code
Car is throwing Converter below threshold code. I figured i would put in MagnaFlow High-Flow cat from my work but didnt know if that would work. The position of the stock 02 sensor is what baffles me.
It seems to me the factory design has the 02 sensor in between 2 chambers. Could I just install this Magnaflow cat and put the 02 sensor after the cat? Can get rid of this code after installing high-flow cat?
Passat (B5) :: Warm Up Catalyst Codes P0421 And P0431
I 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.
Nissan - Maxima :: PO430 Catalytic Converter Code
My 2000 Nissan Maxima has a PO430 code for the catalytic converter that has been going on and off for over 1 year now. My ? is, how would I know that the converter needs replacing? Someone said there wouldn't be any smell necessarily, someone else said I would be leaking qts. of oil in between changes and someone else said it would get bad mileage. Each one debunks the others comments etc. Also just for info., this car had the ses light come on at 57K miles, my brother replaced 2 of the O2 sensors and I replaced 2 also, one duplicate one and a mass air flow as well.
View 1 RepliesGolf VI R :: 2009 TDI - P0420 Catalytic Converter Code
Does this mean the DPF is shot? I believe its integral with the cat. whats worth checking first?
View 2 RepliesToyota - 4runner :: 1996 - Getting Catalytic Converter 420 Code?
1996 4runner here (187,500miles), with weld in after market cat (on when purchased, with less than 1000 mile on it). started throwing the 420 code beginning of last summer. Replaced both O2 sensors and same results. Was coming on after every 30-40 miles after resetting, replaced wires, plugs, cleaned throttle body started coming on ever 120 miles or so. Now in the middle of winter it has gone 450 miles and still has not come back on?? Does the winter fuel blends in Georgia, or cold more dense air make a difference on cat performance? Still plan to replace it with a direct fit with a warranty but curious if I am overlooking something.
View 6 RepliesPassat (B5) :: CEL P0431 - Warm Up Catalyst Below Threshold (bank 2)
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 Replies