Question about 2006 Honda Civic Hybrid

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Check engine light

First, I got codes P1172 (MAF sensor), and P2A00 (o2 sens, bank 1/sens 1). Cleaned MAF sensor first, reset codes. Back on in 2 days (both codes). Replaced MAF sensor, then got just P2A00 (o2 sensor).
Got Bosch universal type o2 sensor (part #15730). Spliced wiring from OEM connector to new sensor, and installed sensor.

NOW, I get code P1157 (air/fuel ratio sensor, bank1 sensor1). I looked up the o2 sensor I got from the parts store on the Bosch website, and they show that part # as the DOWNSTREAM sensor (bank1/ sensor2).
I asked for the UPSTREAM sensor.

Now, my problem is that I don't know whether the 06 Honda Civic requires the o2 sensor or the air/fuel ratio sensor. I feel that the o2 sensor that's now in the upstream side has to come out, but what do I replace it with?

The OEM sensor I pulled out was DENSO (4 wire). I checked their website, and found an fuel/air ratio sensor (part#234-9062). The BOSCH website has an exact fit replacement upstream sensor (Part #13982), which looks exactly like what I took out (it has the cup-shaped heat shield like the original).

One is called an air/fuel ratio sensor(DENSO), and the other is called an oxygen sensor(BOSCH). They are approximately the same price. Which one should I get? The HONDA website was NO help!

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  • Anonymous Mar 31, 2014

    Denso 234-9062 Oxygen Sensor (Air and Fuel Ratio Sensor)

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Sometimes can be prematurely dirty air filter, sets off the air flow sensor, which sets off the o2 sensor. So might try new air filter first and erase codes and then see, before you spend more bucks than you need; then if codes return, do the flow mix sensor.

Posted on Feb 11, 2010

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Ok, well here is the deal on new Honda's. 2 Sensors, upstream is an air-fuel ratio sensor, downstream is a standard o2 sensor.

According to Honda, you seem to have the meanings of the codes off by a little bit. P2A00 is an AF sensor performance problem and P1172 is AF high voltage. So replace the upstream sensor with the AF ratio sensor. Stick to the OEM Nippendenso..

Good luck

Posted on May 18, 2009

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