C4 Oxygen Sensor
Thread Starter
Navigator
Joined: Jul 2024
Posts: 9
Likes: 0
From: NH
C4 Oxygen Sensor
My check engine light has been on, and the car has been running rough. I was able to figure out by using the paperclip that I have bad 02 sensor. My question is, is there any way to figure out what sensor is bad?
My garage does not have the OBD1 scanner so they tell me they have no way of knowing which sensor to replace.
TIA!
My garage does not have the OBD1 scanner so they tell me they have no way of knowing which sensor to replace.
TIA!
Melting Slicks
Joined: May 2014
Posts: 2,894
Likes: 592
From: New Port Richey FL
My check engine light has been on, and the car has been running rough. I was able to figure out by using the paperclip that I have bad 02 sensor. My question is, is there any way to figure out what sensor is bad?
My garage does not have the OBD1 scanner so they tell me they have no way of knowing which sensor to replace.
TIA!
My garage does not have the OBD1 scanner so they tell me they have no way of knowing which sensor to replace.
TIA!
Not to mention 02 sensor is a ware item, it doesn't cost a fortune and isn't a nightmare to replace
Last edited by s carter; Jul 29, 2024 at 05:19 PM.
Thread Starter
Navigator
Joined: Jul 2024
Posts: 9
Likes: 0
From: NH
Burning Brakes
Joined: Dec 2017
Posts: 1,043
Likes: 414
2023 C3 of the Year Finalist - Modified
When my O2 went out, I also had a “driver side lean” code being thrown. Do you have any other codes?
If they have been in there a long time, they will be a huge PIA to change
If they have been in there a long time, they will be a huge PIA to change
Drifting
Joined: Aug 2009
Posts: 1,972
Likes: 243
Your 94 may have 3 oxygen sensors (mine did). One on each bank upstream of the catalytic converters and a single one on one bank, post converter.
Replace the upstream sensors, they are the only ones that matter for fueling. As others have said, no sense in doing one - replace both. The single downstream sensor won’t even throw a code if it is missing altogether. I wouldn’t bother replacing that one.
Replace the upstream sensors, they are the only ones that matter for fueling. As others have said, no sense in doing one - replace both. The single downstream sensor won’t even throw a code if it is missing altogether. I wouldn’t bother replacing that one.
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