what does P1158 HO25 failed to switch to lean/BankB

Asked by Loretta Aug 30, 2012 at 02:55 AM about the 1997 Land Rover Discovery

Question type: Maintenance & Repair

wont pass smog due to high emissions and the check engine light wont turn off. all the censors have been changed. what is P1158 HO25 failed to switch to lean/bank b

1 Answer
9,575

Lars answered 11 years ago

The exhaust oxygen sensor (HO2S) of Bank B (right hand side of the engine) is giving a faulty or no signal, check the wires going to it and ensure the sensor was actually replaced.

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