dc5_dy

- pulled the code and got P0135 (02 Sensor Heater Circuit Malfunction) Bank 1 Sensor 1 (that would be the primary, right?)
- idle was also rough (very low) when engine is hot
- ive read some thread and some people is saying that the IACV is the problem
- wanna make sure which one is the correct before replacing both (dont want to buy both

ezone

P0135 is for the heater circuit on the front O2 sensor.

Low idle is probably a separate issue, but I'd say to fix the O2 sensor first since you know that's a problem and see what that does.

dc5_dy

Do you know what part #? Denso or ngk? Its the upstream, right? Checked densos website but it showing 2 upstream o2 sensors.

ezone

Honda catalog says 36531-P2E-A01. See if that will cross-reference in their catalogs.
IDK, go look on yours, the name should be stamped into the original sensor. You may need to remove it to find it though.


Yes, for P0135.

Upstream=primary=front=first=#1=pre-cat=upper=whatever. All indicate the same thing. Think about it.

The car has 2 total.

One front, one rear. Or primary and secondary. Or...hell, refer to that list up there and figure up the rest of the names.

dc5_dy

ok, i fixed idle problem issue..

my buddy cleaned the throttle body...

now i need to buy the primary sensor..

found some in amazon..

DENSO 234-4099 = $34.54
NGK 24542 = $41.63

i checked my sensor and brand is Denso (i dont know if that is the original, bought the car used 7 yrs ago from a private seller) is it reliable than NGK?

ezone

If you already have a Denso in it now, I'd guess it was original and say to use the same brand again.

dc5_dy

i was gonna replace the sensor but found this..

ezone

Erm, that's real common.
A cracked manifold is a separate problem.
Replacement manifold alone will not fix the P0135.

It (most likely) still needs a new front O2 sensor to fix the code.

dc5_dy

i didnt know it was a common problem on civics..

didnt replace the O2 sensor.. much better if i replace them together..

problem is i cant buy a new aftermarket manifold/cat on EBAY. no legal in CA.

dc5_dy

did a research here..

maybe this is a temp fix?

http://www.autozone.com/autozone/acc...er=515553_0_0_

ezone

What have you got to lose, maybe $10 if it doesn't work?
I've never tried it, but go for it.
I've heard others talk about brazing the cracks closed too.