Error codes
Thread Starter
VaughnCo
Joined: Dec 2016
Posts: 60
Likes: 5
From: Las Vegas NV
Error codes
Hopefully one of you guys can give me some guidance. The check engine light came on in my 05 Z51. It has cam, CAI, Long tubes and one hell of a tune. I do drive it hard. It seems to be running fine, no power loss or hesitations. I did just replace all the plugs and wires a month ago due a plug wire that melted laying on the header. I checked to see if that was the case again but all the wires look good.
P0300 (Random Misfire)
P0030 HO2S Heater Control Circuit Bank 1 Sensor 1
P0135 HO2S Heater Performance Bank 1 Sensor 1
P0030 HO2S Heater Control Circuit Bank 1 Sensor 1
P0135 HO2S Heater Performance Bank 1 Sensor 1
The printout stated that it may be dirty fuel injectors. Any tips you guys can provide to get this resolved with out having to take it to the Dealership would be greatly appreciated.
P0300 (Random Misfire)
P0030 HO2S Heater Control Circuit Bank 1 Sensor 1
P0135 HO2S Heater Performance Bank 1 Sensor 1
P0030 HO2S Heater Control Circuit Bank 1 Sensor 1
P0135 HO2S Heater Performance Bank 1 Sensor 1
The printout stated that it may be dirty fuel injectors. Any tips you guys can provide to get this resolved with out having to take it to the Dealership would be greatly appreciated.
Melting Slicks
Joined: Jun 2005
Posts: 2,734
Likes: 1,695
From: Rochester NY
2018 C6 of Year Finalist
St. Jude Donor '10, '17
Check the 02 sensors. Also check the fuse for them in the fuse box. Should also triple check the wires, the coils and the plugs themselves.
Safety Car
Joined: May 2011
Posts: 3,807
Likes: 508
From: Oshawa, Ontario
Hopefully one of you guys can give me some guidance. The check engine light came on in my 05 Z51. It has cam, CAI, Long tubes and one hell of a tune. I do drive it hard. It seems to be running fine, no power loss or hesitations. I did just replace all the plugs and wires a month ago due a plug wire that melted laying on the header. I checked to see if that was the case again but all the wires look good.
P0300 (Random Misfire)
P0030 HO2S Heater Control Circuit Bank 1 Sensor 1
P0135 HO2S Heater Performance Bank 1 Sensor 1
P0030 HO2S Heater Control Circuit Bank 1 Sensor 1
P0135 HO2S Heater Performance Bank 1 Sensor 1
The printout stated that it may be dirty fuel injectors. Any tips you guys can provide to get this resolved with out having to take it to the Dealership would be greatly appreciated.
P0300 (Random Misfire)
P0030 HO2S Heater Control Circuit Bank 1 Sensor 1
P0135 HO2S Heater Performance Bank 1 Sensor 1
P0030 HO2S Heater Control Circuit Bank 1 Sensor 1
P0135 HO2S Heater Performance Bank 1 Sensor 1
The printout stated that it may be dirty fuel injectors. Any tips you guys can provide to get this resolved with out having to take it to the Dealership would be greatly appreciated.
Le Mans Master
Joined: May 2016
Posts: 7,101
Likes: 1,546
From: Florida
Driver's side O2 Sensor. Check the harness all the way from the sensor back to the connector at the valve cover. Driver's side is a tough side and you might have touched the harness on a header tube somewhere. If the harness is OK, then looks like the heater might have burned out on the sensor. Replace sensor then.
Random misfire is probably related. If the sensor does not warm up (or not sending a temp signal) to a temp the ECM expects to see at a given ECT, then the performance code is usually set. However, the heater circuit failure indicates there is no heater signal being received and that will be accompanied by the performance failure.
Long story short - harness burned through or sensor failure on driver's side.
Random misfire is probably related. If the sensor does not warm up (or not sending a temp signal) to a temp the ECM expects to see at a given ECT, then the performance code is usually set. However, the heater circuit failure indicates there is no heater signal being received and that will be accompanied by the performance failure.
Long story short - harness burned through or sensor failure on driver's side.
