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Car Forum / Nissan / Nissan Cars / May 2006po 420 and oil consumption
My son recently bought a 2002 Sentra SER Spec V with about 85000 miles on it. The car appears very clean and well maintained. The check engine is on with a code po420. We have also noticed the car appears to be consuming about 1 qt every 400 miles or so. The top end of the motor appears to be fairly new looking compared to the rest of the engine. The car does not smoke nor are there any leaks. If the car is burning oil, could it cause the problems with the o2 or the cat converter, whichever is bad? What steps would you guys we take next? Thanks If I recall correctly, there was a recall for the 2002 2.5 liter that could effect the life of the motor (pre-cat?). You might want to contact a local dealer and see if it was done (they can look it up in a national database). If it had not been done (or done to late), I think you're probably well past the warrantee. Gary K > My son recently bought a 2002 Sentra SER Spec V with about 85000 miles > on it. The car appears very clean and well maintained. The check [quoted text clipped - 5 lines] > converter, whichever is bad? What steps would you guys we take next? > Thanks > My son recently bought a 2002 Sentra SER Spec V with about 85000 miles > on it. The car appears very clean and well maintained. The check [quoted text clipped - 5 lines] > converter, whichever is bad? What steps would you guys we take next? > Thanks Sad to say, it looks like he bought someones else's headache. They probably put a new head on it in an attempt to fix it. It likely needs a rebuilt block. How long ago did he buy it? I'd be looking into your state's lemon laws. The seller almost certainly knew. To answer your other question, yes, high oil consumption will shorten a converters life. >> My son recently bought a 2002 Sentra SER Spec V with about 85000 miles >> on it. The car appears very clean and well maintained. >> We have also noticed the car appears >> to be consuming about 1 qt every 400 miles or so. > Sad to say, it looks like he bought someones else's headache. They > probably put a new head on it in an attempt to fix it. It likely needs a > rebuilt block. How long ago did he buy it? I'd be looking into your > state's lemon laws. Doubt a lemon law would apply to a used car. I also bet there was no pre-purchase inspection performed by the buyer?  SignatureSteve http://www.atlantaracing.com > Doubt a lemon law would apply to a used car. I also bet there was no > pre-purchase inspection performed by the buyer? Don't be so sure, MA for one has strong used car lemon laws. Even those from a private sale. > The car does not smoke nor are there any leaks. It isn't going to smoke because the converter burns it off.. > If the car is > burning oil, could it cause the problems with the o2 or the cat > converter, whichever is bad? Neither will cause oil consumption. > What steps would you guys we take next? It's probably an internal engine problem. Most people who buy a "spec V" type car are going to run them hard. I've had to replace/rebuild a few of these with under 100,000 with bad rod bearings/oil burning. Loose rod bearing clearances can cause oil consumption like you describe. Try reving the car up and down fairly hard when cold and look for oil smoke before the cat can lite up. I bet it smokes, then the cat lites off and it stops. SignatureSteve http://www.atlantaracing.com
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