1997 Infiniti I30 P0600, P0130, P0136, P0325, P0500 - OBD II Trouble Codes & Diagnosis Guide

Welcome DCZC! For your 1997 Infiniti I30, start by researching the specific OBD II trouble codes: - P0136: https://www.obd-codes.com/p0136 - P0325: https://www.obd-codes.com/p0325 - P0500: https://www.obd-codes.com/p0500 Since you're new to this vehicle, the best first step is to replace the MIL bulb and clear the codes. If no symptoms appear after that, it may indicate the issues are related to underlying sensor or system faults—no visible symptoms doesn't mean there's nothing wrong. Note: Clearing codes does not guarantee a permanent fix; you'll need to diagnose root causes using proper tools and procedures.

Thank you for the prompt response! I plan to replace the MIL bulb and clear the stored OBD II codes. However, I'm unsure how to do this effectively—do I need a code reader? AutoZone offers free OBD II code reading; they may also provide free clearing services. That said, I believe I'll need to complete a drive cycle before attempting another emissions test in North Carolina. I don't have specific documentation on the Infiniti I30's required drive cycle—any guidance would be helpful!

To clear OBD II codes, you'll need an OBD II code reader. AutoZone provides free code reading and may offer free clearing as well. However, most vehicles require a full 'drive cycle' after code clearing to re-activate the onboard diagnostics. While specific drive cycle procedures for the 1997 Infiniti I30 aren't widely documented, general OBD II drive cycles can serve as a starting point.

Thanks! What exactly is a 'drive cycle'? I understand what OBD II and trouble codes are, but I'm not clear on what a drive cycle is or how to perform it. Could you explain the steps or point me to a reliable source for Infiniti-specific instructions?

A quick search online should yield detailed explanations—try searching 'OBD II drive cycle procedure' or 'Infiniti I30 OBD II diagnostic drive cycle'.

I searched for 'Infiniti I30 drive cycle' and found limited results. However, a general OBD II drive cycle is often used across vehicles. For reference, see this guide: https://www.obd-codes.com/trouble_codes/...-cycle.php It may not be officially defined for Infiniti models, but it's worth attempting as a standard procedure.

I found a general OBD II drive cycle description that might apply to your situation. While it’s not an official Infiniti-specific protocol, it can help reset the diagnostic monitors: OBD II Drive Cycle Steps: 1. Start engine and idle in drive for 2.5 minutes with A/C and rear defrost on—this checks oxygen sensor heater circuits, air pump, and EVAP purge. 2. Turn off A/C and rear defrost; accelerate to 55 mph at half throttle—checks ignition misfire, fuel trim, and canister purge. 3. Hold steady at 55 mph for 3 minutes—monitors EGR, air pump, O2 sensors, and canister purge. 4. Decelerate to 20 mph without braking or clutch depression—checks EGR and purge functions. 5. Accelerate back to 55–60 mph at half throttle—re-checks misfire, fuel trim, and purge. 6. Hold steady at 55–60 mph for 5 minutes—monitors catalytic converter efficiency, misfire, EGR, fuel trim, O2 sensors, and purge functions. 7. Decelerate to a stop without braking—final check of EGR and canister purge. This cycle resets the onboard diagnostics and helps detect recurring faults after repairs.

I went to clear all codes, and they were successfully erased. A forum specific to my Infiniti I30 model suggests a possible VSS (Vehicle Speed Sensor) fault may be the root cause of P0600. I'm now wondering: if the codes return after clearing, how long does it typically take? Also, when someone cleared the P0325 code on another vehicle, they reported needing to try three times. Does this mean a knock sensor replacement is ineffective or only partially resolves the issue? I’ve purchased a new knock sensor (P0325), but I’m unsure whether installing it will clear the code—even if a scan tool couldn’t remove it. Will replacing the sensor resolve the P0325 code, or do I still need to check wiring and connections?

If the P0325 code persists after replacement, it indicates an ongoing issue. Always verify voltage, ground connection, and signal integrity at the knock sensor wiring harness. A faulty sensor or poor electrical connection can cause intermittent or ghost codes. Check for loose wires, corrosion, or damaged connectors. A proper diagnosis with a scan tool is essential before assuming a hardware fix resolves all issues. Keep us updated on your progress—this will help others facing similar problems.

I’ve completed the drive cycle and rechecked the codes. The P0325 code remains, but I’ll continue testing the knock sensor wiring and connections. I’m now confident that a hardware replacement is needed if the signal isn’t stable.