Toyota Aygo - Wiring failure

January 31, 2023
Toyota Aygo - Wiring failure A soldering iron and insulating tape repair to the wiring saved the sensor from being replaced
Share:

When the customer bought this 2015 Toyota Aygo 1.0 VVTi in to me, the engine was running ok, but the engine management light was glowing brightly, indicating a problem.


The first move was, of course, to plug the Aygo into the diagnostic scanner to see what codes would be revealed. A couple of codes came up P0030 and P0031, the first indicating Heated Oxygen Sensor (HO2S) 1, bank 1, heater control - circuit malfunction and the second indicating Heated Oxygen Sensor (HO2S) 1, bank 1, heater control - circuit low.

Although both of these faults could have been caused by a faulty sensor, it is always good not to jump to conclusions and to test the circuit involved before replacing the sensor. Although in this case, if the sensor had been replaced, the problem would have been cured. This was not because the sensor itself was faulty, but because the loom between the sensor and the plug (which would have been replaced) was the source of the problem.

Where the wiring loom had been fixed to the securing clip and held against the cylinder head, it had rubbed through. These sorted wires were the reason for the illuminated light and the trouble codes.

You can download this story as a PDF, as well as other technical tips at TechTips.ie.

There are lots more Tech Tips to view, and they are all searchable, on TechTips.ie.
PREVIOUS ARTICLE
64 new to range additions from Blue Print
NEXT ARTICLE
Keeping a classic Golf on the road

More from GARAGE WORKSHOP

ALLDATA solves Tesla horn issue 

ALLDATA solves Tesla horn issue 

icon The team at the ALLDATA Repair...
UFI Filters confirms Formula 1 leadership in filtration systems

UFI Filters confirms Formula 1 leadership in filtration systems

icon UFI Filters, a leading interna...
Bohernabreena Classic Car Show and Fair set for July<br />
&nbsp;

Bohernabreena Classic Car Show and Fair set for July
 

icon A new charity event, the Boher...
SIMI Award winners 

SIMI Award winners 

icon

The SIMI Irish Motor I...

Schaeffler launches new range of INA auxiliary water pumps

Schaeffler launches new range of INA auxiliary water pumps

icon Schaeffler has introduced a ra...
Juratek enhances braking range with new discs, hoses & pads

Juratek enhances braking range with new discs, hoses & pads

icon Juratek has launched five new...

More from AUTOBIZ