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2000 Lexus LS 430 P0102 MAS Issue & 2002 Sentra P0011, P0335, P0113 Fault Codes - Diagnosis and Fixes

Model: Lesabre and Sentra Fault Code: P0011 Posted: 2014-08-30 12:28

I'm experiencing two separate engine issues with vehicles listed in the title. Vehicle 1: 2000 Lexus LS 430 (74,000 miles) - Recently replaced the Mass Airflow Sensor (MAS) due to persistent check engine light and computer reset issues during smog testing. - The vehicle otherwise runs smoothly and strongly, but has intermittent resets that affect smog compliance. - After a drive of over 100 miles, I was able to pass smog. However, I now experience starting difficulties. - A mechanic suggested replacing the idle control valve (IAC), but the screws broke off during installation. The part has not been replaced yet—only cleaned. Vehicle 2: 2002 Nissan Sentra (156,000 miles) - History of P0011 code with infrequent symptoms and successful smog passes. - Then, after several months, the vehicle suddenly lost power and stuttered at extremely low RPMs for a few miles before failing to start the next day. - New diagnostic codes: P0113 (Intake Air Temperature Sensor) and P0335 (Crankshaft Position Sensor). - Replaced both crankshaft and camshaft position sensors, as well as spark plugs—no improvement. - I'm wondering if this issue is more likely mechanical or electronic in nature. Research suggests a mechanical cause over an electrical one. - Could the Variable Valve Timing (VCT) system or ECM be involved? Any insights or recommendations on next steps would be greatly appreciated, especially regarding potential root causes beyond sensor replacements.

Related fault codes
P0011P0102P0113P0335
Comments (2)
Anonymous 2014-08-30 13:36

Have any components been replaced? No other codes present—this could help in diagnosis. P0011: Likely related to the Intake Valve Timing (IVT) sensor. Check if the connector is secure, look for corrosion or damaged wiring. Do you have experience using a digital multimeter (DVOM)? Wiring diagrams would be helpful. P0113: Intake Air Temperature (IAT) sensor—located in the air ducting. Ensure the connector is tight, no corrosion, and wires are intact. This is a simple thermistor with 5V supply and ground. P0335: Crankshaft Position Sensor (CKP). Check wiring for damage or looseness. Signal verification requires an oscilloscope—blind replacement without proper diagnostics may not resolve the issue. Note: If replacing components, use only genuine Nissan CKP and IVT sensors to avoid compatibility issues. I’m working on creating a wiring diagram reference that can be shared with users for easier troubleshooting. Thanks, .X. 123

Anonymous 2014-08-30 13:42

Forgot about the Buick issue—If both screws broke off during IAC replacement, it's unlikely they would simply fall out. If only one screw failed, check for vacuum leaks. If no leak is found, we can defer that step temporarily. Additional notes: - Starting issues: Does this occur on first start of the day? Or after sitting for a few minutes? - Without IAC or other related codes, perform a fuel pressure test and monitor for fuel pressure drop—this could indicate a fuel delivery issue.