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well for starters I'm assuming you ran the scan test with a Ford scanner to get these codes. If so then........Code 173 means:Heated Exhaust Gas Oxygen (HEGO) sensor- voltage signal indicates "rich" (Bank 1 ).

But....if you had a scanner then you should have the code book along with it right?

As for the answer to whats causing it?

Could be a bad O2 sensor, or a problem with something related to that cylinder such as bad wire, plug, vacum leak, ect. Check and then double check all your usual components using your vehicle's manual troubleshooting list related to that issue to pinpoint the problem.

Code 536 means:Brake On/Off (BOO) switch - circuit failure or not activated during Engine Run Self-test.

Bascially this means you didn't have the handbrake on during the engine self-test. Bad move partner....always THINK SAFETY!APPLY HANDBRAKE DURING ALL runtime testing proceedures.

Thanks and have a great day!

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โˆ™ 2011-09-14 00:36:36
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Q: What does engine code 173-536 mean on a 1993 Ford Ranger 3.0l auto?
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