What does fault code f d mean and how to fix it

Your $7E8 and the $7E9 are fuel/ air intake codes, as for the P1326 Ok, this code is set when the knock sensor detects vibrations from engine rod knock, however, it may be set falsely due to incorrect knock sensor logic programming in the engine control module.

Codes $7E8, $7E9 and P1326? - CarGurus.ca

P0606
The P0606 fault code means that there's an error with your power control module (PCM). Your PCM is the computer inside your car that monitors all the vital systems. Basically, it's the brain of your car. Every time you start the car, the PCM runs a series of checks to make sure everything is okay.

How to Fix the P0606 Fault Code - Solo Auto Electronics

https://www.solopcms.com > blog > fix-p0606-fault-code

P0606 - Meaning, Causes, Symptoms, & Fixes - FIXD

https://www.fixdapp.com > blog > p0606-code
6 days ago - Code P0606 is triggered when there is a fault found in the processor internal to the Engine Control Module (ECM)/Powertrain Control Module ...

P0606 - OBD-II Trouble Code - RepairPal

https://repairpal.com > obd-ii-code-p0606
When the code P0606 is set in the Powertrain Computer, it means that the Powertrain Computer or PCM is failing its own self-check and has found problems with ...

P0606 OBD-II Trouble Code: PCM Processor Fault

https://www.yourmechanic.com > Articles
P0606 code definition PCM Processor Fault What the P0606 code means The Powertrain Control Module is sometimes referred to as the Power Control Module, ...

When this warning shows on dash it means the traction control system has experienced a fault and has turned itself off. You now need to have the traction control system scanned for the fault code or codes and then diagnosis can begin to repair the problems

it means that you have a problem with the emission control sensors and need to have it checked out
have the fault codes read to determine if it is EVAP system fault, HO2S sensor fault or O2 sensor fault
fix what is reported

P0638 means idle speed control actuator / throttle motor fault or throttle pedal position sensor fault these faults can cause drivability problems, check out these items and wiring going to them.

It means there is a fault or multiple faults with the operation of the engine.
There can be many different causes/problems for the CE light to be triggered. It could be just one very minor issue such as failed oxygen sensor or or dirty mass air flow sensor in the air intake or something much more significant. You will not know until the appropriate scanner is hooked up to the car and the fault codes are identified. Quite possibly there will be multiple fault codes generated. The various fault codes indicate the type of fault the computer has identified but the cause or causes then need to be properly diagnosed before you can make any repairs or replace parts. Until the cause is identified and the fault fixed the CE light will continue to display.

You need to get the car to the dealership service center or to a competent mechanic with the correct scanning equipment for your car to identify the faults and the begin the diagnosis from there. Hopefully it will turn out to be something fairly minor and easily fixed.
All independent mechanics will have various scanning equipment but beware as they will not all necessarily be able to pick up all the fault codes being generated on your particular car and fix the fault or faults. (They may pick up one or 2, diagnose the fix for those , do the repair , think all is right and you still have the CE light displaying because there was another code being generated that their scanner did not read.). There can also be some fault codes generated for specific vehicles that are not generic to most cars but specific to a particular brand/model and the independents will not necessarily know what these codes mean unless they specialise in your vehicle model.

Don't delay having the vehicle checked and if in doubt take the car to the dealership service center for your car brand as they will have the latest scanning equipment to cover your model and will pick up all the fault codes being generated.

Generally, once a fault has been corrected it should clear itself. If it does not, there may still be a problem! (NOTE: If the fault code indicates a "sensor," it does NOT mean that the sensor is bad... it means that whatever the sensor is detecting is outside of normal range, and gives a point from which to begin diagnosis!)

please don't play with the air bag , if it deploys it will cost many dollars worth of damage, take it back to the dealer to repair any faults.

P1895 Engine control module (ECM), actual torque signal - circuit malfunctio

Sell this motor quick ,these are nice cars but suffer for these problems because the computer is bolted to the inlet manifold and gets too hot then cooks ,all these petrol engines from around this time suffer from this fault

O2 sensor heater fault.

i had a similar problem with my camry. It was a relay in the fuse box under the hood. I would try this first before you try any expensive fixes. you might even try to swap the ac relay for one of the other relays of the same size and see if the ac works. then you know you need a new relay and didn't waste any money.