Honda Civic 2000 – Stalling issue with CEL

[Damien Hill]

Hey Guys, I had someone bring me a 2000 Civic today which had a check engine light. This car is an automatic, and when in Drive at idle it stalls out from an intersection or when you stop at one. I plugged in my code scanner and I got these two codes:

P1166 Air/Fuel Ratio (A/F) Sensor (Sensor 1) Heater System Electrical Problem
P1167 Air/Fuel Ratio (A/F) Sensor (Sensor 1) Heater System Malfunction

I have attached a photo of the scanner reading. I had to take a second photo after I scrolled down.

Any idea if these two are related?

Attachments:

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Topic

[college man]

see if this helps.

http://www.justanswer.com/honda/0lrdw-fix-p1166-code.html

[Damien Hill]

So I have an update, had the car come back to me today for a good look. I had a spare 02 Sensor which I swapped out to see if it helped, but no joy, the CEL still came back on. So if the 02 Sensor isn’t throwing the code, what else is? (college man) -> Thanks for that link, i’ve had a look through the car and no fuses are blown. The 02 Sensor I changed was the one the Code Scanner listed (Primary). Need to get this sorted as soon as I can.

Appreciate all the help so far – Thank you guys

Cheers!!

[valde]

It may be problem with circuit that sends power to oxygen sensor heaters. It gets its power from no.15 7.5A fuse. If the fuse is ok and has good contact. Measure voltage at heater oxygen sensor heater wire (engine of key on) It should have battery voltage. If it was there you may need to measure voltage across oxygen sensor heater (cold engine running). If it is there then either I’m wrong or problem is intermittent.

[Damien Hill]

Thanks for your reply valde, one thing I just found out.. The Oxygen sensor I replaced it with has the same plug but different colour wires. It has the same thread and came off the same car. But the end of it definitely looks smaller. Also when I put the replacement 02 Sensor on the CEL stays off for a long time compared to the old sensor. But the car idle bounces while accelerating with the new sensor in, so I put the faulty one back in. But what was interesting was the Code reader was showing no reading for the primary 02 while we were driving. Checked every fuse, and all is good.

[Author]

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