knight rider WS6

iTrader: (1)

My ses light has popped on a off this winter. It came on again after starting it on a cold morning. I decided to get a scanner and read it. It said something like o2 heater circuit malfunction bank 1 sensor1. Something in that order. So is that a bad o2 sensor or bad cat? I do have magnaflow highflow cats on. The car also runs fine. Just checkin' to see if yo guys have any input for me. Thanks.

TheLS1Kid

iTrader: (12)

99% sure it is a bad O2 sensor.

A bad cat would throw the codes P0420 or P0430.

joshp14

iTrader: (5)

Make sure the wiring for the driver side front o2 sensor is not burnt against your header. If not, the MOST LIKELY cause is 02 sensor.

knight rider WS6

iTrader: (1)

Besides throwing a code. Is it bad not to change the o2 sensor right away? Will it hurt gas millage?

Lt1Porsche

iTrader: (6)

No it wont hurt anything. The functionality of the O2S itself is not malfunctioning its the heater circuit within the O2S that has an issue. When you turn on your vehicle the computer sends current/ground to the O2S and it raises the temp of the O2S and burns off any film or diposits that are on the sensor. But the sensor still reads correctly when used. The way to fix it would be to replace the O2S. Test for a short burst of current going to the O2S when you first cut the key on should last 3-5 seconds.

knight rider WS6

iTrader: (1)

I erased it. We'll see if it comes back.

iamsickofitall

iTrader: (18)

it will probably come back but it is no big deal...just a symptom of having LT's. it doesn't affect performance at all.

silverLSWON

iTrader: (16)

that code is very common in winter time, i started my car up after sitting all winter and got that code from both o2's. i cleared them and never came back. basically if the o2 doesn't reach a certain temp in a certain time, it will throw that code hintz the always happing in the cold weather. it won't affect anything other than an ses light and if the problem stays, possibly might not pass emissions.