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1999 Nissan Infiniti OBD2 Code P113-5: Is the Sensor Accessible Without Engine Disassembly?

Model: 1999 Nissan Infiniti Fault Code: P1135 Posted: 2017-12-17 12:22

I'm not a mechanic and have no mechanical background, but I recently purchased an OBD2 scanner that connects via the Torque Pro app. I use it to help friends diagnose vehicle issues, potentially saving them money on repair costs. My main question is: Is the sensor causing trouble code P1135 located in an accessible position outside the engine, or does it require engine disassembly to reach? I've also noticed a separate error code, P0141 — indicating a problem with the oxygen (O2) sensor in bank 1, sensor #2. I'm wondering if these two codes could be related or if they represent independent issues. Any insight into whether these problems can be addressed without opening up the engine would be greatly appreciated.

Related fault codes

P1135

Comments (6)

Anonymous 2017-12-17 12:36

Could you please specify the exact year, make, and model of your vehicle? This helps in providing accurate troubleshooting advice.

Anonymous 2017-12-17 14:47

The vehicle is a 1999 Nissan Infiniti.

Anonymous 2017-12-18 12:35

P1135 and P0141 are generally separate issues. While both relate to engine sensor performance, they stem from different systems. For the P1135 code (Camshaft Position Sensor or VVT actuator issue), it's important to first verify that engine oil level and quality are within acceptable ranges. If those are fine, a potential problem may lie in the Variable Valve Timing (VVT) system — this would require professional diagnosis. Regarding P0141: This code can be caused by one or more of the following: - Open or short to ground in the wiring harness - High resistance in the O2 sensor heater circuit wiring - High internal resistance or open/short in the O2 heater element For detailed information, refer to official diagnostic resources on P0141.

Anonymous 2017-12-18 13:20

Thank you for your helpful input. I’ve learned over time that it’s more cost-effective to have a professional handle repairs from the start — otherwise, I’d end up paying twice: once for mistakes made during DIY attempts and again for fixing what was originally needed. I’m actually checking this on behalf of my best friend. If both issues can be resolved without engine access, then it might still be worth repairing. However, if the Camshaft Position (CMP) actuator requires engine disassembly to fix, then the repair cost could outweigh the vehicle’s value. His stepmother recently gave him a 2005 Chrysler Town & Country van in better condition than this Infiniti. Thanks to your guidance, I believe he’ll make a more informed decision — selling it honestly with full disclosure of its issues.

Anonymous 2017-12-18 15:04

Both error codes point to potential external causes — such as bolt-on components or wiring problems — rather than internal engine damage. This suggests that diagnostics and repairs may be manageable without major engine work.

Anonymous 2017-12-18 15:17

Taking a closer look at P1135: Could the vehicle actually be newer than 1999? Was Variable Valve Timing (VVT) present in the 1999 Nissan Infiniti model? While it's possible, VVT systems were more common in later models. Regardless, P0141 is generally a straightforward issue that can be diagnosed and repaired at a repair shop — they can also help verify whether P1135 is truly related to the engine or another system.