DTC P0135/EFI 521 & DTC P0141/EFI 522: Notes

1. DTC P0135/EFI 521
   
   Front HO2S Preheating - Low/High
2. DTC P0141/EFI 522
   
   Rear HO2S Preheating - Low/High

For connector terminal identification, see Figure-Figure and ENGINE PERFORMANCE in appropriate SYSTEMS WIRING DIAGRAM article in ELECTRICAL as follows:

• SYSTEM WIRING DIAGRAMS - C70
• SYSTEM WIRING DIAGRAMS - S70
• SYSTEM WIRING DIAGRAMS - V70

For component locations, see COMPONENT LOCATIONS .