Which 02 sensor (1.3L)

[FGlass]

When a 97 metro 1.3 shows an O2 code, is it the upstream (near manifold) or downstream one (near converter), which is causing the trouble?

[spy1309]

The upstream one

[FGlass]

Thanks,
the exact code said PO 141 "Bank 1 Sensor 2" O2 sensor heater circuit malfunction?

Then there was a 0400 EGR Flow malfunction, but that one was reset and did not reoccur

So is it still the upstream one?
Thanks again
FGlass

[hot_sd]

Sensor 2 is the downstream one(after the catalytic converter). "bank 1 Sensor 2" is the generic interpretation of the OBD2 code. In the case of the Metro bank 1 has no meaning.

Sounds like the heater in the sensor has burned out. You can check it for continuity with a multimeter.

Bit suprised about the EGR code - I have a 2000 1.3L and these do not have EGR. Maybe they were designed out in the later models.

BTW the code is actually P0141 - not PO141 (zero next to the P)