Ford F-150 - 1997-2003 :: Check Engine Light Came On - Error Code P0420
I was driving along today and my Check Engine light came on. I stopped at the nearest Advance Auto to have them pull the code and it came up with the P0420, Catalyst Efficiency Below Threshold (Bank 1). I asked what could cause this and they mentioned that the fuel that was put in could be causing it. They didn't mention any other possible causes. Any others? I'm thinking it could be the fuel because the last gas station that I stopped at and filled up at is one that I never go to, and maybe just got a bad batch of fuel.
View 14 RepliesGolf IV / Jetta IV :: Check Engine Light Came On And Went Away - P0420 Code
MK4 GTi - My check engine light came on a few days ago and when I checked it, it pulled code P0420.
Just this morning, the check engine light went away.
Is this a common issue? Or should I go get it checked just in case?
Toyota - 4Runner :: Check Engine Light Came On And Code Was P0420 - O2 Sensors?
I have recently had about $1620 worth of work done on my 2000 4Runner because the check engine light came on and the code was P0420.. My invoice says they replaced the exhaust pipe assembly. Now 2 weeks later the light is back on with the same code...are the 02 sensors part of the "exhaust pipe assembly" or are they now going to tell me I need a bunch (2-4) 02 sensors replaced.
View 3 RepliesToyota - Corolla :: 2003 - Check Engine Code P0420 - Change The Converter
I have a 2003 Toyota Corolla, mileage app. 106,000. Check engine light first came on when driving to destination 40+ miles away (most of my driving is shorter, around-town trips). My mechanic said code is P0420 and so they reset it and said if it comes on again that I need a new cat converter. It did not come on until about 6 weeks later when I was on a longer trip again (had driven about 40-50 miles). Can you tell me if the P0420 code absolutely means that a new cat. conv. is needed or if it could possibly be a sensor or something else hopefully less costly than a new cc?
View 3 RepliesElantra XD (2001-06) :: 2004 GT Check Engine Light With Code P0420 Listed Twice
I bought an 04 elantra a few weeks ago. The check engine light is now on and I get code P0420 listed twice with my code reader. I have replaced the downstream O2 sensor and reset the codes only for them to return again. It is my understanding that this is going to be a convertor problem. My question is that from the research I have done it looks as though this car has two converters. One at the exhaust manifold and then another in the tailpipe. Which one is going to be the most likely causing my Check engine light to come on. Or do I need to replace both converters.
View 5 RepliesDodge - Dakota :: 2005 V8 - Intermittent Check Engine Light Code P0420
My 2005 Dodge Dokota 4.7L V8 152,000 miles has an intermittent 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 inleakage -- 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?
Prius (2004-09) :: 2006 - Check Engine Light - P0420 Code / Air Leak In Exhaust
So today my CEL came on. I immediately looked at my mileage and I was EXACTLY at 500m past my oil change the other day. I checked the dip stick and lo and behold, it was about 3/4" past the full marker. I took it back to the oil change place and had them drain it down to a good level.
I had driven from NH to NY this week. I filled up my gas tank on my way home from NY. Gas cap was on nice and tight for sure.
The code is still on (not sure how many miles or drive cycles is required) for something to clear. I figured it was perhaps due to too much oil added. I decided a few hours later to take it to AutoZone and grab the diagnostic code. It's a P0420 code (Cat System efficiency below threshold: Air leak in exhaust before rear HO2S, AF Sensor Error, Fuel System Fault, Faulty Catalytic Converter).
Prius (2004-09) :: Check Engine Light Coming On And Off / Showing Code P0420 For Catalytic Converter
My check engine light has been coming on and off and it seems to show P0420 for catalytic converter. The light stays off for about a week and it'll come on for a day or two and off again.
Wouldn't a failed converter stay failed? Can P0420 be triggered by loose/bad gas caps?
Ford F-150 (2004-2008) :: 2005 - Check Engine Light Code P0420 - CAT Threshold Level
Had the check engine light in the 2005 F150 (90,000 miles) come on. Got the code checked and its P0420. I know that has to do with the cat threshold levels etc. so I believe I am looking to replace the o2 sensor, if I am not mistaken.
How hard of a job is this? Ive done a decent amount of engine work and worked in a shop in high school. Just looking to see if that is the right thing to try first, replacing the sensor, before replacing the cat.
Also I know its the right bank, but if I am not mistaken there is a before and after the cat o2 sensor, which do i replace? Both?
Camry :: 2003 LE Check Engine Light Code P0031
I own a 2003 Camry LE. I went to Autozone to find out what the check enginge light was for and was given P0031. When the service person checked it out on the computer he said the probable causes were:
1) open or short circuit conditions
2) poor electrical connections
3) failed oxygen sensor
4) EFI relay fault.
I asked how it could be narrowed down and he said it I would have to get the car checked out.
Camry :: 2003 V4 - P0128 Check Engine Light Code
I'm getting a P0128 code on my 2003 V4 Camry. Autozone diagnosis says it's either
a) coolant low level
b) sensor not working correctly
c) thermostat not working correctly.
As part of 90k mile check about 3500 miles ago, the mechanic replaced the coolant. I didn't check the coolant after he had replaced it but I just checked it today and it's about 1 inch below the full level. Is this normal coolant usage considering that it's been about 3500 miles and 3 months since it was last filled?If the coolant level is okay, then how do I figure out if it's the sensor/thermostat?
Camry :: When Drive Over 80 Mph Within 15 Minutes CEL Comes On With Code P0420
2006 Toyota Camry LE (4 cyl) with 149,500 miles. All maintenance up to date.
Over the past month, anytime I drive over 80 mph within 15 minutes, the CEL comes on with the code P0420. I read the code and erase it. The funny thing is typically I'm getting very good gas mileage during that tankful when the CEL comes on. I've read that it is likely the downstream oxygen sensor and I plan to replace it. (In February, I replaced the air/fuel sensor). My two questions are:
a) What is the part number for the oxygen sensor (non-California emissions)? I want to make sure I get the right part.
b) Why the CEL comes on after travel over 80 mph? Is this coincidence or is there a reason why this happens?
Camry :: 2003 4cyl - When Turning RPM Meter Goes To 3 And Needle Comes Down To 1
My car has 219k miles and has been very loud and when i turn it on the rpm meter goes to 3 and gradually car quiets down and needle comes down to 1. While i drive the steering wheel vibrates too. I took it to the mechanic i was told that timing chain needs replacement as its about time. I was under the impression that timing chains do not need replacement.
The steering wheel vibrates (shakes) it makes light clicking sounds too. I have not been able to diagnose the problem by myself. I think these two things may not be related but engine is really loud. Does timing chain needs replacement? and if it does what else along with it should be replaced?
Camry :: 2003 4cyl Won't Start - New Battery And Starter
My camry won't start I got a new battery and a new starter (they are both good) and it sill wont start.
View 4 RepliesCamry :: 2003 4cyl / Auto - Hesitation Under Load
Our Camry has about 105,000 miles on it. Car is well maintained, I change the oil every 3 k or so and the air filter is clean (although it is not a factory air cleaner- it is a K&N filter). Other maint is done as specified by the warranty/maintenance book although the car is long out of factory warranty.
We occasionally pull a 800 lb pop-up tent trailer and just got back from the Sierras after driving up some pretty tall passes with it. Car ran great, got great mileage, temp gauge rock steady. I say this because it is probably the most stressful driving we do with this car. While we live in the city we are retired and the car is not exposed to constant heavy traffic, dust or snow. Mileage seems to have remained pretty steady, even with the hesitation.
Got home from the mountains and a couple days later the car began to hesitate when under load. The hesitation shows up as a slightly uneven surge when the car is going up a hill or when it is cold. About 20 mph the car seems to momentarily stop accelerating, then evens out and upwards of 40 mph I don't feel it at all. The hesitation is getting a bit worse over the last couple days in frequency, but still isn't felt on the freeway. I don't know if the hesitation is related to the recent trip to the Sierras.
I hooked up my OBD II computer to see if there are any DTCs, none shown, even left the computer on the car for a day to see if anything might pop up when the car surged, but the computer isn't seeing trouble codes.
My other thought was "got some bad gas", ran the tank out and put in new gas, fuel injector cleaner and dryer. With one new tank it hasn't worked. I haven't replaced the fuel filter yet.
Tried driving the car in 1st and 2nd gear only and found that the hesitation isn't dependent on what gear I'm in, but seems to be more about the speed and load. In neutral, slowly revving the engine, I don't detect anything that sounds or looks like a hesitation (just watching the tach).
Been reading about problems some Toyotas have had with unintended acceleration but I'm not sure that is my problem. I have to admit I didn't know that my Camry was "drive by wire" and maybe I don't understand it enough. Maybe a "reflash" might be needed?
My sense is that I should go ahead and do the next major maintenance items including plugs, but if I had a bad plug or plug coil wouldn't that show up as a Diagnostic Trouble Code item?
Could this be a bad injector or fuel filter? Wouldn't they produce a DTC? How do I break down the next steps?
Camry :: 2003 - Check Engine Light On Code P0341/ P0352 And P0354 Displayed
My 2003 Camry with 160k miles is running OK but the check engine light came on and P0341, P0352 and P0354 are displayed with my code checker. I looked up the three codes and could not determine anything that would cause all three codes to display at the same time. I plan to reset the codes to see if and how fast they come back. Is there anything common that could cause all three to display at the same time?
View 1 RepliesCamry :: 2010 2.5 4cyl LE Engine Lacking Power
I have a 2010 Camry Le with the 2.5 4cyl. What I'm trying to diagnose started in the last 2 weeks, the engine just seems like it's lost some power overall but there is no unusual sounds coming from the engine and it has not triggered and codes. I have checked the simple stuff like the air filter and plugs but am not sure where to turn next.
View 7 RepliesCamry :: 2003 Solara 4cyl - Blue Smoke On Start Up
I have a 2003 Solara 4cyl, some months ago it started to blow light blue smoke on start, but would go away after a few minutes. My mech, could be the valve guides. Then about a month ago it blew a head gasket, didn't overheat though, as I stopped, added water and went to the mech. So new gasket and a valve job, but it still blows smoke on start. THe mech said going to 20w50 might work, it didn't. I check the oil last week, thought it should a couple of qts low, so I added oil, but the blue smoke is still there, and I started to smell oil burning. I thought maybe I added too much, so I add another oil change w/20w50....still have the oil burning, blue smoke on start... The mech thinks might be leaking in the rings...ugh....probably could/ve bought a new engine by now...... The check engine light had been intermittent, the mech said it the catalytic converter....it finally went off by itself four days ago....maybe it burned out..........
View 5 RepliesCamry :: 2003 4cyl LE - Cold Air Blown On Passenger Side While Heat Is On
My 03 Camry is blowing cold air on the passenger side while the heat is on. The drivers side blows hot air as it should. The coolant is full. Its a 4cyl LE and does not have dual climate control.
View 14 Replies