Oxygen sensor queston.

[Randy GP]

I'm getting 0141 and 0135, both bank 1, sensors 1 and 2.
What causes these errors?
Bad gas? Water?
Thanks!

[matt5112]

DTC P0135 HO2S Heater Performance Bank 1 Sensor 1

DTC P0141 HO2S Heater Performance Bank 1 Sensor 2

Could be wiring, ground, corrosion in connection, or a bad sensor.

[Randy GP]

Thanks Matt!
Can one bad sensor cause another to go bad?
I was on vacation 2 years ago and an error lit up. It came on soon after filling up the tank.
After the next fill up, it went off.
Can bad gas dirty up the sensors, causing an error?

[matt5112]

http://www.grandprixforums.net/websi...C/1997-L36.pdf

O2S Heater Circuit
Malfunction (Bank 1,
Sensor 2)
P0141

This DTC determines if
the O2 sensor heater is
functioning properly by
monitoring the amount of
time necessary for the O2
sensor to become active
after start - up.

The elapsed time to obtain 0.150V
from the mean O2 bias voltage.
*Time based on table: Time vs Start
Up Coolant Temp.
ECT < 35C
IAT < 35C
ECT-IAT 6C
Avg MAF < 20 gps
From cold start to a maximum
time of 330 seconds.
*Time determined by table.
once per key cycle
DTC Type
B

Could be failing sensors by the description above.

GM (AC Delco) sensors are the best ones.

But pricey.

Denso's are a less expensive but comparable option.

[Randy GP]

Thanks again.