QuestionQUESTION: service engine light comes on, codes p0011 and p0021, changed oil, still same problem, changed vtc solenoid for both banks, still the codes come back, changed oil once again using mobil 1 synthetic, was fine for 4 weeks and code came back. what is next step and is it ok to drive with this code on.
ANSWER: Unfortunately this is a problem with all Nissan variable valve timing engines. Replacing the solenoids and cam sprockets not recommended before running a complete diagnosis. Make sure the oil level is where it is supposed to be and the oil pressure meets specifications. Oil pressure should be measured with an oil pressure gauge. Clear ECU memory and run the car for 5 miles. if codes come back but the engine runs good, the light can be turned off by a Nissan dealer technician.
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QUESTION: thanks for your response,
the car is 2008 infiniti g35 with 160k, the oil was changed every 6000 km execept last 2 times before problem occured, each time over 10,000 km, thinking maybe filter was not good enough for this mileage. since problem occurred changed oil using first agip synthetic and then to mobil 1 synthetic within 1000 km. do you think another oil change would help.
could it be as simple as reseting the ECU or going to dealership for a computer update since I did replace the solenoid.
could this be related to timing chain because of mileage
last visit to dealership they reprogramed the throttle body and now want start opening things up, which i want to avoid
thanks for all your help
Frank
AnswerThere is absolutely no need for expensive synthetic oils. Regular 5W30 is what I recommend for your engine. Frequent oil changes will not help either. This is a problem that you will not be able to repair it yourself because it will require the know how and special tools. If the technician is not sure how the problem can be corrected without doing additional tests and go deeper, (that is exactly what I would have done if I have the vehicle here)then unfortunately it cannot be corrected from here and without hands on diagnosis.
But you can do the following: Disconnect the battery negative cable for 30 seconds or if you can even longer. This will clear any codes stored in the ECU memory. Reconnect the battery and drive the car. See if the CEL comes on again and if it does see if you still are getting P0011 and P0021. If you do, these are the same cam solenoids codes and as you have found out, replacing the solenoids did not correct the problem! This is why I never recommend any parts replacement before I find the real reason, because if you get any trouble code e.g. TPS or O2 it doesn't mean that they are faulty. It could be a TPS that is not properly adjusted or an O2 sensor that gets a lean reading because of a vacuum leak. Same with the cam solenoids. We got oil pressure, the solenoids are new, the solenoid actuators work, next action: testing procedure step by step as it is recommended by the manufacturer!
