1163
UnclassifiedEmissions
What This Code Means
Malfunction Indicator Lamp (MIL) ON; Adaptive multiplier out of range greater than 30% while running on natural gas; Lean exhaust condition (especially at light load); False lean condition; One bank shows high adaptive and the other is low; One bank shows high adaptive and the other bank shows low adaptive
Possible Causes
- •Heated Oxygen (O2) sensor wires mis-routed and contacting the exhaust manifold
- •Large vacuum leaks
- •Crankcase leaks
- •Faulty EPR (Electronic Pressure Regulator)
- •Faulty fuel mixer
- •Low fuel pressure
- •Faulty fuel regulator
- •Contaminated fuel filter
- •Exhaust leak pulling outside air past the O2 sensor
- •Contaminated or spoiled fuel
- •ECM grounds not clean, tight, or in the proper location
- •Crossed O2 sensor leads
- •Heated oxygen sensor wires mis-routed and contacting the exhaust manifold
- •Exhaust leak pulling outside air into the exhaust past the O2 sensor
Suggested Actions
- 1Run the fuel system diagnostic checks
- 2Verify heated oxygen sensor wire routing to ensure they are not contacting the exhaust manifold
- 3Inspect and repair vacuum leaks and crankcase leaks
- 4Inspect and replace faulty EPR or fuel mixer
- 5Check fuel pressure, inspect fuel regulator, and replace contaminated fuel filter
- 6Inspect and repair exhaust leaks
- 7Clean, tighten, and correctly position ECM grounds
- 8Trace O2 sensor wires back to their ECMs and correct crossed leads
- 9Run the fuel system diagnostic checks before proceeding with further diagnostics
- 10Verify ECM grounds are clean, tight, and in the proper location
- 11Trace crossed O2 sensor wires back to their ECMs and correct them
Related Power Solutions International Fault Codes
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