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I have a 1998 Chevrolet Camaro with the 3.8l V6 that has a Service Engine Soon light on. Supposedly an Engine Misfire but I realized that the engine is starting to take oil. Can someone post a picture of how much oil should be on the gauge? Thank you.
 

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The gauge is for oil pressure, not oil level. At idle it should be about 20, cruising speed about 40 (centered) and full throttle 60. Get the codes scanned at autozone. Tell them you have a "service" light and need it scanned. They'll tell you what the code is. Bring us the code and what help you get it figured out.
 

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that is cat converter related
 

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The code is P0420
Technical Description:
Catalyst System Efficiency Below Threshold (Bank 1)

What does that mean? The catalytic converter is a part of the exhaust system that looks kind of like a muffler, although it's job is very different from that of a muffler. A catalytic converter's job is to reduce emmissions from the exhaust. The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). Catalytic converters are not normally a "wear" type item, that is they are not deisgned to wear out and need replacement. If they have failed, it is likely due to something else that caused it to fail.

Symptoms:
The main symptom to the driver is the illumination of the SES (service engine soon) or MIL (malfunction indicator lamp). You will likely not notice any drivability problems, although there may be symptoms. For example, if the substance inside the catalytic converter is broken or failed, it may be restricting the exhaust which will result in a feeling of reduced power output from the vehicle.

Causes:
A code P0420 may mean that one or more of the following has happened: Leaded fuel was used where unleaded was called for.
A damaged or failed oxygen sensor (HO2S).
Downstream oxygen sensor (HO2S) wiring damaged or connected improperly.
The engine coolant temperature sensor is not working properly.
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

Possible Solutions:
Some suggested steps for troubleshooting a P0420 error code include: Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required. Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady). Inspect the downstream heated oxygen sensor (HO2S), replace if necessary.
Replace the catalytic converter.
Overall probably the biggest mistake vehicles owners make when they have a P0420 code is to simply replace an oxygen sensor (H02S). It is important to do proper diagnosis so you're not wasting money replacing parts unnecessarily. We strongly recommend that if you need to replace the catalytic converter that you replace it with an OEM unit. Second choice would be a high-quality replacement part. There are many stories in our forums where folks replaced the cat with a cheaper aftermarket one only to have the code return shortly thereafter. One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
 

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That's what I was thinking. Whenever I rev the motor, you could hear a harsh noise coming from the exhaust.
Sounds as if the converter is clogged.
 

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I have almost the same problem. I bought mine 5 months ago. And was sitting for 10 years before >bought it... My check engine soon light is is but blinks at me if I try to push the car threw the gear if she's trying to no go... I just had oil change I get 3 codes: 1.. coolant sensor 2.. misfire on 3. 3.. and something to do with the cat.. now ik my cat is not broken on the inside... the lady that told me my codes the first time she cleared 2 codes that didn't tell me what was and my car was fine then 2 days later it went into limp mod and is worse than the first time and I Mell gas like it's getting to much ... when I had the oil change just before it started all this. They put in 5w20 or 5w30 and my car say 10w30 only so idk if that destroyed my motor or whats going on I'm ready don't want to pull the motor for a different motor
 
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