Chevrolet - Prizm :: P0420 Code / Replaced Exhaust System - Making Noise
Apr 22, 2011
I have a 2001 Chevy Prizm that I just had the front pipe replaced on. It was not accelerating well and making noise. New front pipe and it feels like a new car. The check engine light came on. i cleared the code, drove it for a day or so, and the light is back on. My exhaust mechanic says we don't really need to worry about the cat con hurting our engine unless we see a decrease in performance. Are there any mechanics out there who would say that is true. The car has 160,000 miles and we want to see it go another 100,000 or so, and not do anything to damage the engine.
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Check engine light emissions evap system code comes up when the system is scanned what could be problem? 1998 chevrolet prizm...
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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. 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?
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just recently installed the new X force exhaust system on my 2008 ISF with 72,000 miles on it. I've had the exhaust on the car for about 300 miles it when I was driving home from work today the vsc and check engine light pops up. I turn the car off when I got home and then turned it back on the check engine light was off but the stored Code was still there when I read it with the scanner P0420. I'm thinking maybe there's an exhaust leak even though it sounds fine.
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About 5 years ago, my air conditioner started making a metallic-sounding grinding noise, when it is turned OFF. This noise goes away if the A/C is on. My mechanic said some part was slightly bent, bent it back, and this fixed it for a while. Eventually the noise came back but was intermittent. I drove the car for years hoping it would go away, leaving the A/C on most of the time. The noise is no longer intermittent, and my new mechanic says that it seems louder than before and if I don't get it fixed, it might cause the car to stall out. He offered to bypass it with a belt or replace the unit. What this could be? I drive with the A/C on now. 1998 geo prizm
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Ok, probably about 1/3 times i start my 96 f150 4.9 with true duals, the left pipe has a higher pitched howling noise, its a steady tone whether I rev the truck up or not it just gets louder. It will do it for about 6 seconds and then stop. The truck doesn't run badly because of it, but i took her to autozone to get her scanned and they said that the oxygen sensor on the first manifold bank has a slow response on startup. Is that what causes this strange noise, I don't even know how it would make it, it sounds much different from the engine. The right pipe doesn't do anything.
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So I recently (within the last month) replaced my DV for a Forge 007 and my stock air box for an EVOMS v-flow. My cel came on after the DV switch and was throwing the P0420 code at me. Then I swapped the intake and it has been good but I felt like I was running a bit rich and pulled my codes and it now has P0030 in addition to P0420. Why this is? I have 88K miles. Spoke to a mechanic and he says he thinks it is my cat dying. I'm a bit confused since I have a turbo back exhaust.
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I have a Chevrolet Prizm 1998 and the heat and cooling system only works on the highest setting which is actually the fan setting. When I have it on any of the other settings such as low or med nothing comes out, it doesn't work. I can hear it click on but nothing comes out. So when I'm driving depending on the weather I have the heat or cold air blasting out of the fan until it gets annoying and I turn it off. I've checked the fuses and they're good. I have not checked the relays because I'm not sure how to do that. I haven't taken it to a shop because I'm poor and don't have a trustworthy mechanic and it works just not on low or med. Should I have this looked at? I don't want to be causing any damage but it seems like it could be something simple.
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I own a 2004 Ford Taurus (3.0L V6, OHV (12), non-flex fuel) registering a P0420 engine code. If I can smell exhaust fumes in the cabin, can I assume there is a leak in the catalytic converter system, or could the O2 sensors be the issue (or could it be the catalytic converter itself...)?
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My Prizm is making a noise that seems to be related to the blower but sounds like it is coming from behind the control panel/radio. Even changes volume and stops with bumps. I am going to check the blower motor motor, but sound doesn't appear to be coming from the dash area where I believe the blower motor is. What else it may be?
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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).
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I have a 1999 Chevy Geo Prizm a.k.a. Toyota Corolla. I am new to car ownership and don't know much about maintenance yet.
Recently, the back right wheel has started making a soft "wumm wumm wumm" noise when the car is in motion. The faster I drive, the more the noise speeds up, so it seems like something is coming loose or out of alignment. I've driven over a fair number of potholes in the last couple of months, and while I don't remember any particularly gnarly ones, I imagine that's what has caused the problem.
Any guesses as to what might be going wrong, how dire it is, and what I should expect to hear from the mechanic when I take it in?
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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.
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When my vent is on the face setting, a grating/whistling noise emanates when the fan is on.This does not happen on the floor or defrost positions. The noise diminishes when it is in the face and partial floor or defrost setting. What may be causing the noise and how I could fix it.
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I drive a 2001 Chevy Prizm with 90,000 miles on it. Lately, when I'm accelerating over about 30 to 40 mph, my engine starts to make a grinding noise, that gets worse the faster I go, or the more pressure I apply. The noise also happens when I'm going up hill. What's causing this noise, so I don't look like an idiot when I take it in to my mechanic?
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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
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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?
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I have a 2011 F350 CC long box 4x4, with a 6.2, 93,000 km on it. I periodically get a P0420. I clear it and sometimes it comes back in 10 or 20 KM and sometimes it comes back in a couple hundred km. Been doing this for about 800 KM.
Yesterday I got an exaust leak at the joint where the exaust manifold meets the pipe beside the engine. Checked close, bolts appear intact, leak is on the outboard side blowing towards the frame. Looks like a gasket or donut seal failed.
I am wondering if the catalytic converter was plugged or restrictive, would this cause the P0420 and could back pressure from a restricted catalyitic converter cause the gasket to blow?
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Hit a nasty speed bump and now the exhaust system on my 97 Camry is making a new sound. I see a cylinder shape which looks like the outside of woven basket. Did the cover come off my catalytic converter? (I was carrying six adults on a Mass. state park road that was as level as the Appalachian mountains with a speed bump half of which had been stolen by local bears.)
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I currently have dual exhausts on my 2002 F150 and that's all I have besides stock for the exhaust system. How can I make it louder without getting rid of the duals?
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2004 chevy malibu classic... My blinkers make weird sounds and does not work half the time unless i hit the hazard lights. problem two theft system light comes on and stays on. problem three shut off car to re-start i think i can i think i can then start no problem after words. fourth problem the seat belt buzzer wont stop have to play with key in ignition.
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