U0587 Invalid Data Received From Radiator Anti-Tamper Device

Some low-emission vehicles have a radiator coated with a catalyst that converts ground-level ozone, known as direct ozone reduction (DOR) or by BASF's trade name PremAir; it earns an emissions credit, and CARB then requires the OBD system to monitor it. A Ford patent filed by Swedish inventors describes the matching sensor: it is pressed into the radiator fins, reports radiator temperature, since the coating works above roughly 60 °C, and sends an encrypted message so the engine controller knows the original part is fitted; a frangible pin stops it being moved to another radiator. U0587 means that message arrives but fails verification or plausibility. No manufacturer documents U0587 publicly. U0286 is the lost-communication code.

Likely causes

Symptoms

• Check engine light on
• No noticeable change in driving or cooling

Repair estimate

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

Parts involved

Related codes

References: data.epo.org, law.cornell.edu, automotive-transportation.basf.com.