Throwing P0171 and P1170 codes

[B-R-Z]

Did this today and it seems to have resolved the sound issue, exhaust smell under the hood, and CEL's so my initial problem is gone.


Which got rid of my other codes, but now I have:

[Wayno]

Originally Posted by B-R-Z

Did this today and it seems to have resolved the sound issue, exhaust smell under the hood, and CEL's so my initial problem is gone.


Which got rid of my other codes, but now I have:

Damaged heated O2 sensor and/or plug.

[churchx]

HLHachiRoku: it's about different rates of thermal expansion of header & engine on heating up and cooling back that flex joints were meant to deal with, not about how tight mounted header feels on cold engine. But true, most recent headers for FA20 don't have flexjoints anymore, so i guess even that thermal expansion wise it deemed not necessary after rich experience for few years of platform being around, and was eliminated for manufacturing simplicity/costs and mechanical strength reasons ..

[steve99]

Originally Posted by B-R-Z

Did this today and it seems to have resolved the sound issue, exhaust smell under the hood, and CEL's so my initial problem is gone.


Which got rid of my other codes, but now I have:

as @Wayno said damaged 02 sensor or wiring or o2 sensor not conected or blown EFI HTR fuse see http://www.ft86club.com/forums/showthread.php?p=2206548

[B-R-Z]

And this is the one with the gray connector that connects first in line going from motor to overpipe?

[steve99]

Originally Posted by B-R-Z

And this is the one with the gray connector that connects first in line going from motor to overpipe?

yep theirs a grey and black connectors, make sure grey to grey and black to black as the front/rear 02 sensors are different.


The one with shorter cable goes to front o2 longer one to rear cannot remember colours off hand.

[B-R-Z]

But I'm trying to determine which one may have the issue, is it possible to determine that based off of cel code?

[steve99]

Originally Posted by B-R-Z

But I'm trying to determine which one may have the issue, is it possible to determine that based off of cel code?

from cel code its sensor 1 which should be front 02 sensor

[B-R-Z]

Do you happen to know what I can do to troubleshoot? I checked the fuse but it looks ok

[steve99]

Originally Posted by B-R-Z

Do you happen to know what I can do to troubleshoot? I checked the fuse but it looks ok

brz wiring diagram


http://www.google.com.au/url?sa=t&rc...wTIabWl0Jc6WWw




page 105 and 106 wideband 02 is front o2 sensor


both have heaters
looks like green/whit is earth (b+) and heater is HA1A and HT1B


un plug sensors and measure resistance of heater, if its open circuit then its likely the o2 is stuffed.


don't measure or probe connectors with o2 plugged in as its directly back to ECU and you might stuff the ECU.


check with ignition OFF and connectors unplugged probe the 02 sensor not back towards ECU.

[B-R-Z]

Thanks steve. To test this, I need to check the resistance between the +/- leads of the heater? I'm still not sure which wires to test, the diagram doesn't make much sense to me.

If it does turn out bad, am I ok buting a Bosch sensor or should I go oem? Any pointers are appreciated

[steve99]

Originally Posted by B-R-Z

Thanks steve. To test this, I need to check the resistance between the +/- leads of the heater? I'm still not sure which wires to test, the diagram doesn't make much sense to me.

If it does turn out bad, am I ok buting a Bosch sensor or should I go oem? Any pointers are appreciated

best run the oem one unless the bosh is a direct replacement with exact same charasterisics as oem sensor.

test for resistance between ground and the HA1A and HT1B conection on each sensor the wiring is colour coded

alse take it to a shop for them to test

[B-R-Z]

It says bank 1 sensor 1 doesn't that narrow it down to the sensor before the cat

[steve99]

Originally Posted by B-R-Z

It says bank 1 sensor 1 doesn't that narrow it down to the sensor before the cat

yes thats the one its indicating
but sensors are expensive, so it best to confirm it no good