Cat. 02 sensor used as primary?
Thread Starter
Honda-Tech Member
Joined: Feb 2001
Posts: 2,503
Likes: 0
From: Clearwater, FL, USA
Cat. 02 sensor used as primary?
try the search but no results were yielded.
Is the cat. and primary 02 sensor identical in function. Can they be interchanged with no adverse effects? Thanks.
Is the cat. and primary 02 sensor identical in function. Can they be interchanged with no adverse effects? Thanks.
Lover
Joined: Feb 2002
Posts: 1,777
Likes: 0
From: Jacksonville, FL, United States
Re: Cat. 02 sensor used as primary? (HONDADNA)
it does matter on an obdII ecu, because it reads before and after the cat, so it can adjust fuel. but as far as putting a OBDI ecu in it will just need the wires in the right pins. 
Honda-Tech Member
Joined: Oct 2001
Posts: 4,611
Likes: 3
From: Severn, MD
Re: Cat. 02 sensor used as primary? (AK1200)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HONDADNA »</TD></TR><TR><TD CLASS="quote">Yes! both secondary and primary serve the same function - they meassure o2 content in the exhaust stream. the only difference is length of the wiring that's all.</TD></TR></TABLE>
Lets clarify: They both OPERATE exactly the same, however, their purpose to the ECU is different.
You CAN use a secondary O2 in place of a primary, and vice-versa.
HONDADNA is correct.
Lets clarify: They both OPERATE exactly the same, however, their purpose to the ECU is different.
You CAN use a secondary O2 in place of a primary, and vice-versa.
HONDADNA is correct.
Trending Topics
Joined: Apr 2003
Posts: 319
Likes: 0
From: USA
Re: Cat. 02 sensor used as primary? (AK1200)
The main purpose of the secondary o2 is to monitor the cat operation.
all o2 sensor does one thing " MEASSURE o2 CONTENT IN THE EXHAUST"
The secondary o2 sensor does not switch from rich to lean unlike the primary does. The ECU monitor the how oxygen in the cat is using. A good operating cat will use all of the oxygen to properly convert gases.
while the primary o2 switch from rich to lean and this is want the ecu is looking at.
So, you can swap secondary and primary o2 sensor do exactly what the name stay. The only difference is the length of wires. and if you've got a four wire, three wire, or a singal wire.
The ecm don't if you swap primary to secondary it just wants to know how much oxygen is present.
all o2 sensor does one thing " MEASSURE o2 CONTENT IN THE EXHAUST"
The secondary o2 sensor does not switch from rich to lean unlike the primary does. The ECU monitor the how oxygen in the cat is using. A good operating cat will use all of the oxygen to properly convert gases.
while the primary o2 switch from rich to lean and this is want the ecu is looking at.
So, you can swap secondary and primary o2 sensor do exactly what the name stay. The only difference is the length of wires. and if you've got a four wire, three wire, or a singal wire.
The ecm don't if you swap primary to secondary it just wants to know how much oxygen is present.
Thread
Thread Starter
Forum
Replies
Last Post
