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Old 07-13-2020, 01:43 PM #76
Shaylum Shaylum is offline
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I got my 05 v6 4Runner and the VSC and TRAC lights were on along with a check engine light. Tightening the gas cap fixed it a few times but it got to the point where the lights just stayed on. I even ordered a new gas cap and now the light just stays on forever. Decided to replace all my o2 sensors and this affected my gas mileage significantly (went from (400 range to 320). After a bit of driving it slowly rose back up to like 380 range. Decided to take it to a mechanic to get the lights fixed and they said both of my upstream o2 sensors are reading bad. Thing is, I just replaced those a couple months back. They said it may be because they were bad o2 sensors to begin with but the lights were still on before I even touched the o2 sensors and the downstream sensors are reading just fine, so that doesn’t make any sense in my head. I’m so lost in trying to figure this out. I’ve checked my a/f heater fuse as well and my spark plugs. The codes I apparently have are P2238, P2241, & P0606. The first two are upstream o2 sensors and the third one is computer related. If anyone has any suggestions I would be greatly appreciative as this is getting ridiculous.
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Old 08-24-2020, 10:03 AM #77
HTXTRD HTXTRD is offline
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2019 TRD Off Road - CEL, TRAC OFF & Multi-Terrain Select Indicator

Hey All,

Purchased a used 2019 T4R TRD Off Road just last week. CEL, TRAC OFF and Multi-Terrain Select Indicator lights all came on yesterday evening. MTSL was blinking. DTC below:

P0121 - Throttle/Pedal Position Sensor/Switch "A" Circuit
P043E Se - Evaporative Emission System Leak Detection Reference Orifice
P043F Se - Evaporative Emission System Leak Detection Reference Orifice
P2401 - Evaporative Emission System Leak Detection Pump Control Circuit
P2402 - Evaporative Emission System Leak Detection Pump Control Circuit
P2419 - Evaporative Emissions System Switching Valve Control Circuit Low

- I checked the gas cap...looks fine...on tight.
- Tried turning the Multi-Terrain on/off, but it wouldn't turn on and the light kept blinking. (I did go into 4LO)
- I cleared the codes and drove around a bit. All clear so far and the MTSL turned off , but expect they will all return.
- Once I cleared the codes, I tested the Multi-Terrain, Crawl Control, A-TRAC, and locking differential functions. All worked with no issues.

Any insight would be much appreciated!
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Old 08-28-2020, 08:44 PM #78
syncretic.buffalo syncretic.buffalo is offline
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Smile

FYI

Ended up being the plugs and coils in the front - replaced all 8 and am back in business now.

Went on a 7k Roadtrip and had no issues.
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Old 09-01-2020, 10:21 PM #79
HTXTRD HTXTRD is offline
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Repairs Complete....

FYI....codes below occurred b/c a leak in the Evap system as codes note. Dealership (warranty) did a smoke test to find the leak. The Charcoal Canister was the culprit....it's been replaced and all issues seem to be resolved.

Side Note.....Toyota 4Runner Forum [4Runners.com] is a more active site for new users...

Quote:
Originally Posted by HTXTRD View Post

P0121 - Throttle/Pedal Position Sensor/Switch "A" Circuit
P043E Se - Evaporative Emission System Leak Detection Reference Orifice
P043F Se - Evaporative Emission System Leak Detection Reference Orifice
P2401 - Evaporative Emission System Leak Detection Pump Control Circuit
P2402 - Evaporative Emission System Leak Detection Pump Control Circuit
P2419 - Evaporative Emissions System Switching Valve Control Circuit Low
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