Trouble codes P1425, P1472, P0102, P0134, P0135 and P0141

Hi,

That's a lot of codes. LOL Let's take a look at what they all mean.

P1425 17833 Tank Vent. Valve Short to Ground

- Check Evaporative Emission (EVAP) canister purge regulator valve.

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P1472 17880 EVAP Emission Contr.LDP Circ Short to Ground

Evaporative Emission (EVAP) canister system
- Evaporative Emission (EVAP) canister system, checking for proper seal.

Leak Detection Pump (LDP)
- Leak Detection Pump (LDP), checking.

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P0102 16486 Mass or Volume Air Flow Circuit Low Input

Intake System
- Intake system, checking for leaks (false air).

Mass Air Flow (MAF) Sensor
- Check Mass Air Flow (MAF) Sensor.
- Check wiring diagram.

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P0134 16518 O2 Sensor Circuit No Activity Detected Bank 1 Sensor 1

Oxygen sensor and oxygen sensor control before catalytic converter
- Oxygen sensor and oxygen sensor control before catalytic converter, checking.
- Check wiring diagram.

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P0135 16519 O2 Sensor Heater Circuit Bank 1 Sensor 1

Oxygen sensor heater for oxygen sensor before Three Way Catalytic Converter (TWC)
- Oxygen sensor heater for oxygen sensor before Three Way Catalytic Converter (TWC), checking.

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P0141 16525 O2 Sensor Heater Circuit Bank 1 Sensor 2

Oxygen sensor heater for oxygen sensor behind Three Way Catalytic Converter (TWC)
- Oxygen sensor heater for oxygen sensor behind Three Way Catalytic Converter (TWC), checking.

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Okay, that looks like a lot, and to some degree, it is. However, there are two systems being affected. One is the evaporative emissions system (EVAP) and the other is related to the heated O2 sensor. The mass airflow is also affected, but it is indicating low voltage. The first thing to do is check the connection. Make sure it isn't damaged, corroded, or have a pin pushed in at the connector. If you look below at pic 1, I circled the MAF. Check that first.

Here is a link that shows how to clean a MAF. It may be a good idea to try this as well.

https://www.2carpros.com/articles/mass-air-flow-service

Next, see pic 2 which shows the location of the heated O2 sensor. Check to make sure it is connected because there is no signal.

Pic 3 shows the leak detection pump. Again, there is a short to ground, so check the wiring to make sure nothing is shorted. Check the insulation on the wiring, remove the connector and check if the pins are damaged and touching, or anything indication a short.

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Let me know what you find or if you have other questions. To be honest, focus on one specific thing at a time. Also, let me know how or if it is running.

Take care and God Bless,

Joe

Hi Adam,

These problems can be very frustrating, can you please post the exact codes you are getting along with the VIN of you vehicle? This will help me identify and advise on you problems. Please post response on this thread so I get a notification and I can respond ASAP.
Mark ( mhpautos)

Hi Adam,

I have had a look at these codes and I would suggest as a first up check, as you did mention that the car has had an engine replaced is to,
1 check for vacuum leaks especially at the intake manifold as the P0102, P0134, P0135, and P0141 are all related to possible air leaks, P0102 is a fault with the mass air flow sensor, it can be dirty, faulty, affected by air leaks or the electrical connection may have faulty pins or corroded connections, The the 3 other Poxxx codes are related to the O2 sensors, firstly check the electoral connection are clean and tight and these codes can also be related to induction air leaks. The 2 P14xx codes are EVAP purge valve faults the purge valve may be faulty or have a poor electrical connection. I would first check vacuum leaks and electrical connections, repairer and obvious issues and clear codes and road test, re scan and report what if any codes are reset, pending on the quality of the scanner, you may see some of the codes re set in the history code set, these will not be active codes. Often with engine replacement, simple over sites such as poor electrical connections can cause simple but annoying problems. Let me know how you get on

I have added some links to assist with testing and cleaning components.

https://www.2carpros.com/articles/mass-air-flow-service
https://www.2carpros.com/articles/how-to-check-wiring
https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor