× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

P1646 Diagnostic Trouble Code Discussion for November 2011

Hydraulic Cooling Fan Control Circuit Low

Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P1646
Help Request Posted
2004 Jaguar S-Type 3.0L MIL Lamp on, stays in open loop VIN: SAJEA01T44
P1646: ho2s sensor bank 1 sensor 1. ... check engine light on. scanned w/ auto ingenuity and baum iscan and both showed code p1646(ho2s b1s1). replaced sensor with no change. found ecm is only grounding precat o2s heaters for less than 10 seconds when engine first started(engine at N O Temp). gr...
November 15, 2011