Can u tell me what this code means- p1131 lack of h02511 switchs indicates lean.

Thomas Herlihy

Asked by Jul 16, 2013 at 10:02 PM about the 2001 Ford Taurus SES

Question type: Maintenance & Repair

1 Answer

Tracy Hooks

Lack of H02s 1-1 switching? It means that the Upstream Oxygen Sensor in Bank 1 is always lean. The best approach is to watch both of the Upstream Oxygen sensors' output with a diagnostic scan tool. If #1-1 is always lean and #2-1 switches then it is likely that HO2S #1 has failed. If you don't want to spend the money on a scanner or pay someone for a diagnostic check, you could take your chances and swap it out yourself and see what happens. It's located in the exhaust system directly below the exhaust manifold nearest the firewall. HO2s 1-1 = Heated Oxygen Sensor #1 on Bank 1.

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