U049E: Invalid Data Received From Direct Ozone Reduction Catalyst Temperature Sensor

What it means

A control module received invalid data from the direct ozone reduction catalyst temperature sensor. The code identifies a data validity fault; the specific affected function depends on the vehicle.

At a glance

• Usually lights the warning light of the system that lost communication
• Affects emissions; the car can fail an emissions test

How it works

The direct ozone reduction catalyst temperature sensor reports temperature information through a vehicle control module to other modules. This code sets when a receiving module judges the reported data invalid; it does not by itself prove that the sensor or catalyst is faulty.

Common causes

Most likely first.

1. Fault in the transmitting module or sensor
2. Network wiring or connector fault
3. Module power or ground fault
4. Software or configuration issue

Symptoms

• An emissions or engine warning may appear
• Emissions control may be affected

How to diagnose it

1. Record freeze-frame data and scan all modules for communication or sensor codes to identify which module reported the invalid temperature data and when it occurred.
2. Use live data to compare the reported catalyst temperature with ambient temperature when cold and with expected changes as the exhaust warms.
3. Inspect the direct ozone reduction catalyst temperature sensor connector and its harness for heat damage, corrosion, loose pins, or chafing.
4. Check the transmitting module's power and ground and inspect the relevant network wiring and connectors for opens, shorts, or poor connections.
5. If wiring and supplies are sound, use the manufacturer's diagnostic procedure to check sensor and module data validity, then verify software and configuration compatibility.

Common fixes

• Repair a loose, corroded, or heat-damaged sensor connector or harness.
• Restore a faulty power or ground connection at the transmitting module.
• Replace the direct ozone reduction catalyst temperature sensor if testing identifies it as the source of invalid data.
• Repair or replace a faulty transmitting module if its inputs, power, ground, and network connections check out.
• Correct a software or configuration mismatch using the manufacturer's procedure.

Can I keep driving?

If the vehicle runs normally and has no other warnings, a short, gentle drive may be possible, but emissions control or monitoring may be impaired. Avoid ignoring persistent warnings and arrange diagnosis, especially if drivability changes or additional alerts appear.