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U049E Invalid Data Received From Direct Ozone Reduction Catalyst Temperature Sensor

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Direct ozone reduction (DOR) means a catalytic coating on the radiator, sold by BASF as PremAir, that turns ground-level ozone into oxygen while air flows through the core. CARB grants an emissions credit for it and, under section (e)(14) of 1968.2, wants OBD to watch the coating on cars that claim the credit; a temperature sensor on the radiator serves this purpose. U049E applies where that sensor reports over a data link and its messages arrive but fail plausibility. A hard-wired sensor instead uses P2567 to P2570. No manufacturer documents U049E publicly. U019D marks a sensor that has gone silent. The car drives normally; the result is a MIL, a suspended ozone catalyst check and possibly a failed inspection. Check wiring and the sensor before suspecting the radiator.

Likely causes

Radiator temperature sensor electronics faulty
Damaged connector or wiring near the radiator (impact, corrosion)
Replacement radiator or sensor not matching the original DOR version
Sensor or engine controller software version not matching

Symptoms

  • Check engine light on without noticeable drivability change
  • Emissions inspection failed or readiness not set

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–400
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

dor catalyst temp sensor

Related codes

U019DP2567P2568

References: law.cornell.edu, automotive-transportation.basf.com, trid.trb.org.