How to fix P0128 and P0420 on chevy aveo 2010?

Asked by HadK Nov 21, 2017 at 10:51 AM about the 2010 Chevrolet Aveo 1LT Sedan FWD

Question type: Maintenance & Repair

I have chevy Aveo 2010 LT. Recently I got the P0128 and P0420 codes
about at the same time. The temperature gauge was at the quarter for more
than a month (when I drive the car) and never reached the operating
temperature even after hours of driving. Yesterday I took the car again on the
highway and the gauge indicator dropped to C and never came back up
again. I checked the ECT sensor mounted directly above the thermostat
(Sensor 1) and when it is disconnected the voltage across its harness leads
is 12V (when the switch is ON), and its resistance ~2K ohm after driving
about 20 min. I also checked the ECT sensor on the thermostat housing
(Sensor 2), the voltage across its harness leads is 5V (when the switch is
ON), and its resistance is 8K ohm when the car is cold. I was not able to
check the last sensor at the bottom of the radiator (Sensor 3). I don't know if
the voltage across Sensor 1 is normal or not. Are those the ECT sensors in
the car? What is the wiring diagram? How can I fix the problem (at least the
P0128)? The mechanic asked for $400 to fix it and this very expensive to
me. I appreciate any help, thank you very much.

3 Answers
30

GuruT6RWW answered 6 years ago

I believed this stuff.... so I went out and purchased and had installed a new Cat Convertor. Also replace both O2 sensors.......1200.00 5 months later and guess what? Yep!!! P0240 codes again

3 people found this helpful.
Mark helpful

Your Answer:

Related Questions

Aveo

Looking for a Used Aveo in your area?

CarGurus has 8 nationwide Aveo listings starting at $4,900.

Postal Code:

Shortcuts

Search Chevrolet Aveo Questions

CarGurus Experts

  • #1
    Rowefast
    Reputation
    440
  • #2
    Gene Arnett
    Reputation
    420
  • #2
    firebird338
    Reputation
    420
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Cruze
63 Great Deals out of 1,057 listings starting at $1,695
Used Chevrolet Malibu
54 Great Deals out of 1,092 listings starting at $1,495
Used Honda Civic
195 Great Deals out of 4,054 listings starting at $440
Used Chevrolet Colorado
28 Great Deals out of 1,585 listings starting at $5,800
Used Chevrolet Impala
6 Great Deals out of 94 listings starting at $3,495

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.