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Old 07-06-2017, 01:04 PM
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Exclamation 2002 Sentra SER P0302 code

I bought a 2002 Sentra SER V-spec from this dude a few weeks ago. It has 159k on it. When he handed me the keys he mentioned he changed the oil and plugs that day. Skip forward a few days and the engine light comes on, and I read the code for a cylinder 2 misfire, I also noticed there was very little oil left, I topped of the oil and a week later it has gone down noticeably, without any puddles under my car. No overheating going on either.
The car also has issues to turn on, usually takes 2 or 3 times to start.

Do you guys have any ideas on what the issue could be?
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Old 07-06-2017, 05:05 PM
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If you want to spend as little as possible on diagnostics for excessive oil consumption, send sample of your oil for analysis. Just google oil analysis and pick your provider.
For the P0302 misfire, pull the ignition coil and see if there's oil in spark plug well. While at it, do the same for the remaining ignition coils.
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Old 07-06-2017, 11:05 PM
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If you are burning a lot of oil with a 2002 Sentra with a QR25DE engine, chances are you have a bad engine. You can confirm this with a compression test. 2002-2004 QR25DE engines found in some Sentras and Altimas had issues with the upstream catalytic converter substrate coming apart due to the ECM programming. These vehicles used the variable valve timing to perform the EGR functions, rather than using a conventional EGR valve system. It cracks open the exhaust valves during the intake stroke to pull exhaust gas into the engine. With the converter breaking apart, what would happen is that bits of catalyst substrate would get sucked into the combustion chamber, where it would score the cylinder walls and create an engine with poor compression. Nissan addressed this issue with a recall that included reprogramming the ECM software with updated programming, adding additional shields to the catalytic converter and, depending on the results of the compression test, replacing the exhaust manifold/catalytic converter assembly and (initially) the engine short block. Later, they just went with replacing the long block assembly. The recall is no longer in affect and not every vehicle that was affected received the recall. Others had the recall but still ended up have oil burning engines down the line. Another possibility is a blown head gasket, which is also not unheard of on these engines. A compression test and cylinder leakdown test can confirm either of these possibilities.
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