2005 Nissan Maxima P0011 and P0021 Fault: Causes, Fixes, and DIY Solutions for VVT Issues

P0011 and P0021 are related to Variable Valve Timing (VVT) systems. The codes often indicate issues with the VVT solenoid or oil flow due to sludge buildup in the valve train. Consider adding one can of 'Risolone'—an oil detergent available at Walmart, AutoZone, or Advance Auto—to help dissolve gum deposits. This may improve performance if the problem stems from internal sludge affecting the VVT solenoids. For more details: https://www.obd-codes.com/p0011, https://www.obd-codes.com/p0021

I bought this used vehicle from a private seller with 'as-is' terms. The engine runs smoothly otherwise, but the shifting and idle issues are significant. I don’t want to risk damaging the transmission or engine by replacing parts without understanding the root cause. Any practical, cost-effective solutions would be greatly appreciated.

Buying a used car from any brand carries inherent risks—Nissan is no exception. While some vehicles may perform well over time, older models like the 2005 Maxima are prone to known mechanical issues. The advice provided (like using oil additives or checking for leaks) is helpful—but it's important to verify the actual cause before replacing parts. Please update if you find a resolution.

I added Risolone as suggested, but there was no improvement in shifting behavior or engine performance. Still experiencing P0011 and P0021 codes. Thanks for the tip though—I’ll keep testing other options.

Has anyone found a permanent fix for these codes on a 2005 Nissan Maxima? Still no acceleration or smooth shifting after multiple sensor replacements.

I own a 2006 Maxima 3.5L and am experiencing similar symptoms—hard starting, stalling, jerking under load, and stuck in 5th gear. I replaced both camshaft sensors; it worked for one day before the issues returned. After that, I replaced all cam and crank sensors with new parts. No improvement. Recently noticed a burning oil smell—this may point to internal engine problems like worn valve train components or leaking seals.

I have the same issue on my 2005 Maxima. After replacing both camshaft sensors, hard shifting stopped—but P0011 and P0022 codes remain. Now it won’t accelerate properly and smells like burning oil. I’ve taken it to several mechanics who say they don't know what’s wrong. This suggests a deeper mechanical issue beyond sensor failures.

Check all air intake hoses and clamps for looseness or leaks. Spray carb cleaner around the intake system while the engine is running—any surging indicates a leak. Inspect the intake collector for cracks or worn gaskets. If no leak is found, consider replacing the VVT solenoid. In rare cases, incorrect camshaft timing (due to misalignment) can cause these codes and poor performance. A professional diagnostic tool is essential—many repair shops offer free diagnostics. Avoid relying solely on AutoZone’s basic scanners; they may not detect underlying issues accurately.

The root cause of P0011 and P0021 in 2005 Nissan Maxima models is often a failed inner timing cover gasket. This paper gasket can degrade over time, allowing oil to leak into the valve train. Small fragments may be found in the oil pan as evidence. Replacing this gasket costs around $20 but requires labor of approximately $1,500—this repair is highly effective and widely documented for this model year. If you find oil residue or debris in your oil, this should be prioritized.

I recently completed a timing chain replacement on my 2006 Maxima 3.5L and received P0011—however, I found no paper gasket during disassembly. My galley gaskets were intact and the cover sealed properly with no leaks. After reassembly, the engine runs smoothly but still shows a rough idle and pending codes (P0011 and P0303). I suspect wiring issues or faulty VVT solenoids may be contributing. I’m continuing to investigate—any insights would be helpful as I gather more data.