How many heated oxygen sensors does this wiring diagram show?

Four: Left Rear HO2S #21, Left Front HO2S #22, Right Rear HO2S #11, and Right Front HO2S #12, each fed by circuit 702 R/BK from splice S122 (page 25-9).

What wire color feeds power to the oxygen sensor heaters?

Circuit 702, a red/black (R/BK) wire, coming from splice S122 shown on page 25-9, through connectors C, D, E, and F.

What are the wire colors for the crankshaft position (CKP) sensor?

The CKP sensor circuits shown are 727 GN (green) and 726 BL (blue), with a 65 BK ground and a CKP sensor shield drain, through connector C129.

What connector is used for the knock sensor?

The knock sensor (KS) connects through connectors C138F/C138M, with circuits including 727 GN, 726 BL, 65 BK/R, and 761 W.

Do manual and automatic transmissions use different connectors in this diagram?

Yes. Footnotes mark * MANUAL and ** AUTOMATIC variations: manual uses C142M/C142F and C120F/C120M, while automatic uses C144M/C144F and C121F/C121M.

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Ford Probe Oxygen Sensor, CKP & Knock Sensor Wiring Diagram - PCM Circuits

Wiring diagram for crankshaft position and heated oxygen sensors with knock sensor and color codes

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Wiring diagram showing crankshaft position sensor, heated oxygen sensors and knock sensor circuits with color-coded wires.

Part of 1993-1997 Ford Probe Wiring Diagrams

AI caption August 2010 · Photo 45 of 676

This document is a factory-style engine management wiring diagram showing the connections between the powertrain control module (PCM, labeled 'SOLID STATE' at the bottom, with the left-margin label cut off but reading '...WERTRAIN CONTROL MODULE') and several engine sensors. It covers the Crankshaft Position (CKP) Sensor, the Knock Sensor (KS), and four heated oxygen sensors: Left Rear HO2S #21, Left Front HO2S #22, Right Rear HO2S #11, and Right Front HO2S #12. Power to the oxygen sensor heaters comes from splice S122 (referenced on page 25-9) via circuit 702 R/BK through connectors C, D, E, and F. The diagram documents circuit numbers and wire colors (e.g., 727 GN, 726 BL, 65 BK, 738 BL/W, 734 GN, 735 PK/W, 737 PK/BL, 761 W), connector identifiers (C129, C127M/C127F, C1020M/C1020F, C130M/C130F, C1030M/C1030F, C138F/C138M, C244, C247, C248), shield drains for the CKP and left/right HO2S wiring, ground splices S110 and S101 with ground points G104 and G108, and cross-references to grounds pages 14-9, 10-10 and 10-14. Footnote symbols distinguish manual (*) versus automatic (**) transmission connector variations (C142M/F, C144M/F, C120F/M, C121F/M). PCM pin numbers (15, 14, 16, 13, 18, 2, 3, others illegible) appear along the bottom.

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Frequently asked questions

How many heated oxygen sensors does this wiring diagram show?: Four: Left Rear HO2S #21, Left Front HO2S #22, Right Rear HO2S #11, and Right Front HO2S #12, each fed by circuit 702 R/BK from splice S122 (page 25-9).
What wire color feeds power to the oxygen sensor heaters?: Circuit 702, a red/black (R/BK) wire, coming from splice S122 shown on page 25-9, through connectors C, D, E, and F.
What are the wire colors for the crankshaft position (CKP) sensor?: The CKP sensor circuits shown are 727 GN (green) and 726 BL (blue), with a 65 BK ground and a CKP sensor shield drain, through connector C129.
What connector is used for the knock sensor?: The knock sensor (KS) connects through connectors C138F/C138M, with circuits including 727 GN, 726 BL, 65 BK/R, and 761 W.
Do manual and automatic transmissions use different connectors in this diagram?: Yes. Footnotes mark * MANUAL and ** AUTOMATIC variations: manual uses C142M/C142F and C120F/C120M, while automatic uses C144M/C144F and C121F/C121M.