SPONSORED LINKS

Check Engine Light-Main oxygen sensor fault

Tiny
THOMASNATALE
  • MEMBER
  • 1989 TOYOTA PICKUP
  • 2.4L
  • 4 CYL
  • RWD
  • MANUAL
  • 200,000 MILES
ODB1 error code 21 1. Are there two sensors? 2. How do you determine if it is just needing a new sensor and if there are two which one is the bad one? 3. Can you point me to where a diagram will show the location of the sensor(s)? 4. Are these very difficult to remove and replace?Thank you!
SPONSORED LINKS
Tuesday, April 7th, 2015 AT 11:43 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
There is only one it will be in manifold or exhaust pipe close to engine. They are easy to replace. There is no diagram of these.
Was this
answer
helpful?
Yes
No
Tuesday, April 7th, 2015 AT 12:22 PM
Tiny
THOMASNATALE
  • MEMBER
  • 2 POSTS
Thanks for the answer. Since the engine is still running fine, is it most likely just the sensor is bad? Thanks again.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Tuesday, April 7th, 2015 AT 1:18 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Cold be that but until you actually check it then I can't say. It can also be a short in wiring or maybe a bad pcm. But try a sensor due to it's age.
Was this
answer
helpful?
Yes
No
Tuesday, April 7th, 2015 AT 3:09 PM

Please login or register to post a reply.

Related Oxygen Sensor Location Content

VIEW MORE

Sponsored links