Why would my Civic VX throw code 1?
#1
Why would my Civic VX throw code 1?
Hi,
I just recently purchased a 1992 Civic VX with about 156k miles. Long story short (and why I'm posting on this thread), the CEL was lit when I bought the car which turned out to be code 48 (LAF).
I tried cleaning the sensor by soaking it in Seafoam for about 12 hours but that didn't do anything. However, I was able to find one at a pull-it-yourself junkyard that happened to get a 1994 VX in that day. I'm not sure of the mileage on that car as someone pulled the dashboard cluster.
Well, after physically comparing the sensors, I swapped them. Unfortunately, the CEL is still lit but it's no longer code 48. Upon jumpering, the CEL blinks on for 1 second, off for 3 seconds, ad infinitum. There are no short blinks. I tried clearing the ECU by pulling the backup 7.5A fuse twice to verify. According to the repair manual I have (1st Ed, 9/91), code 1 (if that's what it interprets to) indicates the Oxygen Sensor for D15B8, D15B7 & D16Z1 engines. My engine is etched with D15Z1.
So I took a closer look at the two sensors. Both sensors look exactly the same: 5 colored wires going to the same plug slots. The only difference is my original one had no markings on the sensor itself but the "new" one only says "L1H1" & "Made in Japan."
Before I dished out the fortune required to buy a new one, I wanted to check with those more experienced than I for any other things I could try.
Thanks!
P.S. I noticed in a forum about the O2 sensor socket being a pricey item. I found that my local Harbor Freight had both a deep socket version & a crows foot version for $5/each, the latter of which was on sale for $4. It works like a champ.
I just recently purchased a 1992 Civic VX with about 156k miles. Long story short (and why I'm posting on this thread), the CEL was lit when I bought the car which turned out to be code 48 (LAF).
I tried cleaning the sensor by soaking it in Seafoam for about 12 hours but that didn't do anything. However, I was able to find one at a pull-it-yourself junkyard that happened to get a 1994 VX in that day. I'm not sure of the mileage on that car as someone pulled the dashboard cluster.
Well, after physically comparing the sensors, I swapped them. Unfortunately, the CEL is still lit but it's no longer code 48. Upon jumpering, the CEL blinks on for 1 second, off for 3 seconds, ad infinitum. There are no short blinks. I tried clearing the ECU by pulling the backup 7.5A fuse twice to verify. According to the repair manual I have (1st Ed, 9/91), code 1 (if that's what it interprets to) indicates the Oxygen Sensor for D15B8, D15B7 & D16Z1 engines. My engine is etched with D15Z1.
So I took a closer look at the two sensors. Both sensors look exactly the same: 5 colored wires going to the same plug slots. The only difference is my original one had no markings on the sensor itself but the "new" one only says "L1H1" & "Made in Japan."
Before I dished out the fortune required to buy a new one, I wanted to check with those more experienced than I for any other things I could try.
Thanks!
P.S. I noticed in a forum about the O2 sensor socket being a pricey item. I found that my local Harbor Freight had both a deep socket version & a crows foot version for $5/each, the latter of which was on sale for $4. It works like a champ.
#2
Re: Looking for suggestions on Civic VX O2 sensor problem...
Hi all!
Just wondering if anyone had any thoughts at all on my previous post? Is there any other information I should add?
Thanks!
-Jeff
Just wondering if anyone had any thoughts at all on my previous post? Is there any other information I should add?
Thanks!
-Jeff
#4
Re: Why would my Civic VX throw code 1?
Hi Ron,
I'm not sure why I didn't consider that it might be a code 10. I'll see if I can find a replacement TA sensor, once I figure out where it's located. Would the Intake Air Sensor have a drastically negative effect on gas mileage like the O2 sensor would? I'm only getting around 35mpg (in good driving conditions) so far...
Thanks!
-Jeff
I'm not sure why I didn't consider that it might be a code 10. I'll see if I can find a replacement TA sensor, once I figure out where it's located. Would the Intake Air Sensor have a drastically negative effect on gas mileage like the O2 sensor would? I'm only getting around 35mpg (in good driving conditions) so far...
Thanks!
-Jeff
#5
Re: Why would my Civic VX throw code 1?
Yes, a bad IAT sensor (also called TA sensor) could affect gas mileage. Is it just unplugged? It has a 2P connector with a Red/Yel wire and a Grn/Wht wire.
Last edited by Former User; 10-15-2010 at 07:56 PM.
#6
Re: Why would my Civic VX throw code 1?
Hi Ron,
Actually, it turns out one of the wires on the harness to the IAT was broken close to the plug. When I went to pull the plug out, the other wire broke. I was able to acquire a new harness but there was no change after I wired it in so I'll try changing the sensor out tomorrow. I'll report back with the results.
Thanks!
-Jeff
Actually, it turns out one of the wires on the harness to the IAT was broken close to the plug. When I went to pull the plug out, the other wire broke. I was able to acquire a new harness but there was no change after I wired it in so I'll try changing the sensor out tomorrow. I'll report back with the results.
Thanks!
-Jeff
#7
Honda-Tech Member
Re: Why would my Civic VX throw code 1?
hey, can I buy your dead O2 sensor? I am doing a VX swap into my LX and I need the plug for the sensor itself... PM me if you are interested please
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