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I have a 98 ford tourus have a troulble code of P1151. i cant find this code in the books

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P1151 - Lack of HO2S21 Switches - Sensor Indicates Lean - This is your Bank 2 sensor, which is on the drivers side.

  1. Check intake air system for leaks, obstructions and damage
  2. Check air cleaner element, air cleaner housing for blockage
  3. Verify integrity of the PCV system, check all PCV and vacuum hoses for leaks
  4. Check for vacuum leaks
  5. Check for water in the harness connector
  6. Check for corrosion or poor mating terminals and wiring
  7. Check for excessive fuel pressure, or low fuel pressure or running out of fuel
  8. Check for leaking at the fuel pressure regulator
  9. Check for an improperly seated engine oil dipstick
  10. Check oil level for an overfill
  11. Check for exhaust leaks before or near the HO2S(s)
  12. Replace the Oxygen Sensor

Posted on Mar 17, 2011

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Ford P1151 = Lack of heated oxygen sensor bank 2, sensor 1 switches, sensor indicates lean.

This oxygen sensor is on the bank of cylinders that includes cylinder number 2 and is before the catalytic converter. It is indicating lean--which could mean the sensor is just old or contaminated, or it could mean there is some unmeasured air which is making its way through the cylinders on that bank either through a vacuum leak (intake manifold) or an exhaust manifold gasket leak. Could also mean there is a fuel injector on that bank of cylinders that is clogged or not operating.

Posted on Mar 17, 2011

Not a Generic Code

MFG Specific

P1151---Lack of HO2S-21 Switch,
Sensor Indicates Lean

O2 Sensor trying to correct for a rich condition,
thus goes lean

I have 27 Possible Causes in the Diagnostic
trouble Code Chart

Common DIY

Worn out Sensor
Too Much Fuel Pressure,doubt that
Leaking Injector,maybe
Vacuum leaks on ducting from air filter to throttle
PCV Leaks
Oil dip stick not sealed
Egr ,issues
EVAP System leaks

Posted on Mar 17, 2011

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