These sensors play a vital role in regulating the air-fuel mixture entering the catalytic converter. A faulty sensor, especially the sensor located after the converter (downstream sensor), could be sending incorrect signals causing the engine to run rich (too much fuel). This excess fuel can burn in the converter, generating extreme heat.

Hey Ross,

It sounds like you’re dealing with quite a puzzle there! It’s frustrating when multiple lights come on without any corresponding diagnostic trouble codes (DTCs). While it’s unusual for there to be no codes at all, intermittent communication issues or power/ground problems could potentially cause this.

Given that you recently had work done at the Nissan dealer, it’s worth double-checking if any connections might have been affected during the ECM reprogramming or brake inspection. Sometimes, issues can arise after servicing that require a closer look.

Since you’ve already checked the wheel speed sensors and they seem fine, it might be worthwhile to inspect other electrical connections and modules for any signs of damage or loose connections.

If the problem persists, it might be best to consult with a qualified mechanic or dealership technician who can perform a more thorough diagnostic check to pinpoint the root cause of the issue.

Hang in there, and I hope you’re able to resolve the problem soon!

Despite recent rebuilding, there could be internal transmission issues causing the code to reoccur. This might include problems with the torque converter itself, internal seals, or valve body components.

This could be a faulty torque converter, slipping clutch, or other internal problem in the transmission itself. The sudden drop in RPM as you try to engage gear puts stress on the transmission, causing it to stall.

It’s important to remember that attempting repairs on your car yourself can be dangerous and may void your warranty. It’s strongly recommended to consult a qualified mechanic to diagnose and fix the problem safely and effectively.

While your mechanic might be trustworthy, getting another assessment from a different mechanic (ideally one specializing in Lexuses) could provide a wider perspective. They might offer alternative solutions or cost estimates for repairs.

Damage to the wiring harness leading to the glow plugs can disrupt power delivery.

Completely disabling a turbocharger while the engine is running is complex and potentially dangerous. Blocking the airflow can lead to overboost and engine damage. Diverting the airflow requires complex valving systems and precise control to avoid disrupting engine performance.