Today, I’m working on a Toyota and dealing with some diagnostic trouble codes. I’m going to use my trusty c reader scanner, which has always served me well. If you’re interested, I can provide some affordable scanner links in the description below.
Upon scanning, I found two DTCs in the ECU. The codes are P0441, P0455, P0441, and P0445. Let’s decipher these codes:
P0441 indicates an evaporative emission system with incorrect purge flow, while P0455 points to a large leak detected in the evaporative emission system.
In my experience, faulty fuel caps are the culprit for these issues about 95% of the time. The seal around the gas cap deteriorates over time, causing problems. I replaced the gas cap on this Toyota to see if it resolves the issue.
Additionally, the maintenance and check engine lights were on, and the owner mentioned that the VSC track light also came on simultaneously. After some research, I found that these specific codes often trigger the VSC track light. I cleared the codes and monitored the situation.
After erasing the codes, I turned off the car. To my satisfaction, the VSC track light and check engine light were both off. Now the test is to observe whether the gas cap replacement has resolved the issue.
I’ll keep you updated.
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What diagnostic trouble codes did the scanner find in the Toyota ECU?
The scanner found two diagnostic trouble codes (DTCs) in the ECU: P0441 and P0455.
What do the diagnostic trouble codes P0441 and P0455 indicate?
P0441 indicates an evaporative emission system incorrect purge flow, while P0455 indicates an evaporative emission system leak detected (large leak).
What was the likely cause of the diagnostic trouble codes?
The likely cause of the diagnostic trouble codes was a bad fuel cap, as a deteriorated rubber o-ring seal around the gas cap can lead to these issues.
What additional issue was reported by the owner of the Toyota?
The owner reported that the VSC track light came on when the check engine light was on, indicating a potential correlation between the diagnostic trouble codes and the VSC track light.
What was the outcome after replacing the gas cap and clearing the codes?
After replacing the gas cap and clearing the codes, both the VSC track light and the check engine light turned off, indicating a successful resolution.